It can also be found in schists and marbles. else { Ask-A-Mineralogist from the Mineralogical Society of America Hancockite was named in honor of Elwood P. Hancock (1834-1916), a presitigous mineral collector specializing in New York and New Jersey minerals. Rare mineral, a silicate of magnesium and aluminium with the chemical formula 8 (Al,Si) 6 O 20 (with iron as a major impurity). This mineral is the green inclusion in Unakite Jasper. if (gAutoPrint) Epidote (Greek - addition) is named after the numerous crystal faces. 4.4cms AXINITE EPIDOTE CRYSTALS cluster peru mineral specimen collectors a306 ROCHARTS. Help on Above, Ito T , American Mineralogist , 32 (1947) p.309-321, The structure of epidote (HCa2(Al,Fe)Al2Si3O13). S - Stereo Pair on/off The stilbite, in this case the most important species on this item, features well developed, highly lustrous and excellent terminated crystals. H - Help Screen Epidote is an abundant rock-forming mineral, but one of secondary origin. html += printReadyElem.innerHTML; J. Epidote in unakite Epidote in a different unakite Epidote in Catoctin Formation metabasalt Epidote-family mineral zoisite, with black hornblende and red corundum (ruby) Epidote marking a fault contact between two gneisses. Striated - Parallel lines on crystal surface or cleavage face. alert("Could not find the printReady section in the HTML"); else Ask about Epidote here : A - Atoms On/Off Brittle - Uneven - Very brittle fracture producing uneven fragments. Ask about Epidote-(Pb) here : The photos above show epidote that has filled an amygdule in a highly altered basalt. Epidote Group. Mindat.org's Discussion Groups var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); (2006) with the modifications done by IMA (Proposal 09A, Mills et al. Drag2 - Resize Epidote is a calcium aluminum iron sorosilicate mineral. printWin.print(); drag1 - LMB Manipulate Structure { The stone known as Dream Quartz is Epidote in … From shop ROCHARTS. It is also a product of hydrothermal alteration of various minerals ( feldspars , micas , pyroxenes , amphiboles , garnets , and others) composing igneous rocks . }, Minerals in Thin Section-University of North Carolina, University of Colorado - Mineral Structure Data, Ca2(Fe+++,Al)3(SiO4)3(OH) = Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH), Valid Species (Pre-IMA) 1801 - Dana # Changed from 58.2.1a.7, a = 8.98, b = 5.64, c = 10.22, Z = 2; beta = 115.4° V = 467.58 Den(Calc)= 3.69. Drag1 - Manipulate Crystal M - Menu html += '\n\n\n'; Sale Price $23.99 $ … Diaboukara, Arrondissement Diakon, Cercle de Bafoulabé, Kayes Region, Mali - Numerous of bow tie shaped creme white and lucent crystals of stilbite accompanied by dark olive green coloured blocky epidote and botryoidal, grey prehnite. if (printReadyElem != null) if (document.getElementsByTagName != null) F - Fit to Screen { Epidote in Thin Section Thin Section GigaPans. The type locality is Bourg d'Oisans, Dauphiné, France. if (headTags.length > 0) S - Stereo Pair on/off © Fabre Minerals, Mouse Espa�ol Formula: Ca 2 (Al 2 Fe 3+)(Si 2 O 7)(SiO 4)O(OH) 2 Monoclinic Description: Epidote is a common mineral formed during low grades of metamorphism and hydrothermal activity. printWin.document.write(html); Mineral. Epidote is a silicate mineral that is typically observed in domestically metamorphosed rocks with composed of Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH) T… The characteristic pistachio green … Epidote Characterized by its peculiar green color and one perfect cleavage, this mineral was discovered in 1801 in France. var printReadyElem = document.getElementById("printReady"); } I - Data Info P - Polyhedra On/Off Ask-A-Mineralogist from the Mineralogical Society of America } Epidote, any of a group of colourless to green or yellow-green silicate minerals with the general chemical formula A 2 B 3 (SiO 4)(Si 2 O 7)O(OH), in which A is usually calcium (Ca), though manganese (Mn) or cerium (Ce) is sometimes substituted, and B is generally aluminum (Al), with the main substitution being ferric iron (Fe +3). Handcockite - Renamed to Epidote-(Pb) - Recommended nomenclature of epidote-group minerals, Eur. Help on Above. Calcium 15.44 % Ca 21.60 % CaO. Keyboard "); var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); Epidote differs from the monoclinic dimorph of zoisite (clinozoisite) in that it contains an admixture of the corresponding iron silicate which is unknown as an independent mineral. S - Stereo - Start-Stop Rotation Actual epidote mineral is the most commonly known member of the epidote family. printWin.document.close(); { RMB - Cycle Display Modes It occurs in marble and schistose rocks of metamorphic origin. Original Rockhounds Discussion Group if (printReadyElem != null) } Original Rockhounds Discussion Group A supergroup of monoclinic sorosilicates with the general formula given above. function printSpecial() © Lou Perloff / Photo Atlas of Minerals, Mouse if (document.getElementById != null) } It forms during the metamorphism of an impure limestone and is especially characteristic of contact metamorphic deposits in limestone. The name is derived from the Greek word "epidosis" which means "addition." I - Data Info tourmaline). may not work well with some computers. Dispersion r > v perceptible. Mouse Strzegom, Strzegom-Sobótka Massif, Lower Silesian Voivodeship, Poland - The voilet fluorite crystals grown up on two side on a big microcline. B - Bonds On/Off } Mineral Discussion Forum from Fabre Minerals - also available in Epidote belongs to a group of related minerals. It is a lustrous yellow-green crystalline mineral, common in metamorphic rocks. Warning: this large pop-up is very compute intensive and Epidote Formula Ca 2 Fe 3+ Al 2 (Si 2 O 7)(SiO 4)O(OH) Crystal System Monoclinic Crystal Habit Prismatic, Fibrous, Massive Cleavage Perfect, None, None Luster Vitreous (Glassy) Color yellowish green, brownish green, black, yellow, gray Streak grayish white Class Monoclinic - … It is generated through the hydrothermal process in the cracks. urchinTracker(); Print or Cut-and-Paste your Epidote Specimen Label here : Epidote is named after the numerous crystal faces. Epidote - Interesting Epidote crystal structure nestled amongst Quartz crystals. The "Sum" values are summations of the column of "Atom Units" down to the element listed. Which is a calcium aluminum silicate hydroxide with a chemical formula of Ca2Al3(SiO4)3(OH). html += '\n\n'; It is an end member of a solid solution series with clinozoisite. Scale: 7 x 5 cm. Espa�ol There are also several mineral associations of epidote, including quartz, calcite, garnet, albite, hornblende and apatite.Various other green gemstones can cause confusion, including vesuvianite (idocrase), dravite tourmaline, diopside and green garnet. Epidote, a monoclinic mineral with the idealized formula Ca 2 Al 2 Fe 3+ [Si 2 O 7 ] [SiO 4 ]O (OH), was named by Haüy (1801). if (document.getElementsByTagName != null) H - Help Screen html += '\n\n'; Notice that the element Iron is missing from the formula for Clinozoisite. } } The name comes from the Greek epi over plus dotós given (verbid of didóni), i.e., given besides, “increased”. function printSpecial() tourmaline). Prismatic - Crystals Shaped like Slender Prisms (e.g. if (gAutoPrint) Location: Franklin, Sussex County, New Jersey, USA. The color of the epidote is typical: a sort of off-color yellow-green. { { It is an abundant rock-forming mineral, but one of secondary origin. alert("Could not find the printReady section in the HTML"); html += headTags[0].innerHTML; printWin.document.open(); Mineral Discussion Forum from Fabre Minerals - also available in The name Epidote comes from the Greek words "epi" which means "over" and "didonai" which means "to give". Hancockite is scientifically recognized as an individual mineral species with a chemical formula of CaPb2Al2Fe (SiO4)3(OH). else It is following the revision of nomenclature, changes and content published by Armbruster et al. Rockhounds Discussion Group on Yahoo Groups Rockhounds Discussion Group on Yahoo Groups General Epidote-(Pb) Information : Chemical Formula: (Ca,Pb,Sr)2(Al,Fe+++)3(SiO4)(Si2O7)O(OH) Composition: Molecular Weight = 583.18 gm Strontium 3.00 % Sr 3.55 % SrO: Calcium 8.25 % Ca 11.54 % CaO: Manganese 2.83 % Mn 2.43 % MnO / 1.35 % Mn 2 O 3: Aluminum 9.25 % Al 17.48 % Al 2 O 3: Iron 8.62 % Fe 12.32 % Fe 2 O 3: Silicon 14.45 % Si 30.91 % SiO 2 alert("Sorry, the print ready feature is only available in modern browsers. Biaxial (-), a=1.79, b=1.81, g=1.83, bire=0.0400, 2V(Calc)=88, 2V(Meas)=50. Epidote: Nagashima M, Akasada M (2010) X-ray Rietveld and 57Fe Mossbauer studies of epidote and piemontite on the join Ca2Al2FeSi3O12(OH) - Ca2Al2MnSi3O12(OH) formed by hydrothermal synthesis American Mineralogist 95 1237-1246: 2010: synthetic: 0: 293: 0016952: Epidote _uacct = "UA-3067463-1"; assumed that each mineral is electrically neutral and that the positive charges - Pink, lead-rich variety of Epidote. The color is green, grey, brown or nearly black, but usually a characteristic shade of yellowish-green or pistachio-green. In that series, the iron of epidote is gradually replaced by aluminum to the end member clinozoisite composition of Ca2Al3(SiO4)(Si2O7)O(OH). Chemical Formula: Ca2 (Fe+++,Al)3 (SiO4)3 (OH) = Ca2 (Fe,Al)Al2 (SiO4) (Si2O7)O (OH) Composition: Molecular Weight = 519.30 gm. Iron 24.20 % Fe 34.60 % Fe 2 O 3. Those of metamorphic origin is a mineral found in basic rocks that contain a lot of calcium and aluminum. A - Atoms On/Off "); printWin.document.open(); Comments: Clear crystals of clinohedrite on hancockite (epidote-(Pb)). { drag2 - RMB Resize/Rotate a mineral, calcium aluminum iron silicate, Ca2(Al, Fe)3Si3O12(OH), occurring in green prismatic crystals. Relatively large crystals of flawless facet rough are not uncommon, but faceted stones are limited to small sizes and may appear black because of the dark tone of the material. { html += '\n\n\n'; NAME( MinRec) PHYS. Epidote forms a solid solution series with the mineral Clinozoisite. I - Indicies html += headTags[0].innerHTML; (AntBidBlaNic2). One side together with strzegomite, a variety of epidote. var html = '\n\n'; Epidote in Hand Sample. © Lou Perloff / Photo Atlas of Minerals, Comments: Reddish brown prisms of hancockite on matrix. var html = '\n\n'; General Epidote-(Pb) Information : Chemical Formula: (Ca,Pb,Sr)2(Al,Fe+++)3(SiO4)(Si2O7)O(OH) Composition: Molecular Weight = 583.18 gm Strontium 3.00 % Sr 3.55 % SrO: Calcium 8.25 % Ca 11.54 % CaO: Manganese 2.83 % Mn 2.43 % MnO / 1.35 % Mn 2 O 3: Aluminum 9.25 % Al 17.48 % Al 2 O 3: Iron 8.62 % Fe 12.32 % Fe 2 O 3: Silicon 14.45 % Si 30.91 % SiO 2 var gAutoPrint = true; // Flag for whether or not to automatically call the print function of Minerals,2nd ed.,1990) OPTIC PROP. printWin.document.write(html); Prismatic - Crystals Shaped like Slender Prisms (e.g. Epidote is a stone that can be pistachio green, gray or black. var gAutoPrint = true; // Flag for whether or not to automatically call the print function var printReadyElem = document.getElementById("printReady"); Comments: Dark green, blocky epidote with transparent quartz. if (document.getElementById != null) description: In exceptional large cabinet specimen for the species from Peru with mostly lustrous green sharp crystals to 4.0 cm in size covering all but two sides of this matrix. Massive - Uniformly indistinguishable crystals forming large masses. specimen number: 8032767. location: Cerro San Cristobal, Canete, Lima Dept., Peru. urchinTracker(); Print or Cut-and-Paste your Epidote-(Pb) Specimen Label here : Scale: Not Given. Well developed crystals of epidote, Ca2Al2(Fe ;Al)(SiO4)(Si2O7)O(OH), crystallizing in the monoclinicsystem, are of frequent occurrence: they are commonly prismatic in habit, the direction of elongation being perpendicular to the single plane of symmetry. Help on Above, Dollase W A , American Mineralogist , 56 (1971) p.447-464, Refinement of the crystal structures of epidote, allanite and hancockite. 2009). A2M3(Si2O7) (SiO4)O (OH) Name: After the principal member of the group. The combination of quartz with this stone, due to the amplification properties of quartz, helps it to have a stronger action to resonate this combined energy outwards. printWin.print(); Epidote has a chemical composition of Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH). 5 out of 5 stars (38) 38 reviews. It is found in magmatic rocks. They occur as prismatic, slender grooved crystals and as fibrous radiating aggregates. The color is green, grey, brown or nearly black, … drag2 - RMB Resize/Rotate Location: Franklin, Sussex County, New Jersey, USA. var headTags = document.getElementsByTagName("head"); Location: Copper Mt., Prince of Wales, Alaska. printWin.document.close(); Biaxial (-), a=1.723-1.751, b=1.73-1.784, g=1.736-1.797, bire=0.0130-0.0460, 2V(Calc)=62-84, 2V(Meas)=64-89. General Epidote Information. colorless, pale rose, or greenish yellow. Aluminum 3.90 % Al 7.36 % Al 2 O 3. This and many more mineral specimens are available for sale at Dakota Matrix Minerals. { Epidote is a calcium aluminium iron silicate hydroxide that belongs to the Epidote group of minerals. { Mineral Structure Data. 2006, 18, 551-567. a = 9.03, b = 5.62, c = 10.29, Z = 2; beta = 115.9° V = 469.75 Den(Calc)= 4.12. Zoisite is orthorhombic with Z = 4 whereas clinozoisite and epidote are isostructuiral monoclinic and have Z = 2. It is particular common in metamorphosed basalts and gabbros where it replaces plagioclase, pyroxene and olivine. The Epidote group is composed of minerals of the general formula Ca 2 Al 3 Si 3 O 12 (OH). Epidote in a Highly Altered Basalt. The interference colors, too, are classic: various shades of pastels within individual grains.The opaque material around the amygdule is a mixture of glass, hematite and chlorite. Epidote in epidosite, plane polars PROP.(Enc. Dbl Clk - Start-Stop Rotation P - Polyhedra On/Off Dispersion strong, r > v. greenish yellow, greenish brown, or greenish yellow. Members of the epidote mineral group have a crystal structure that consists of isolated and paired silica tetrahedrons. } else Epidote definition: a green mineral consisting of hydrated calcium iron aluminium silicate in monoclinic... | Meaning, pronunciation, translations and examples drag1 - LMB Manipulate Structure alert("Sorry, the print ready feature is only available in modern browsers. Keyboard Primarily of interest to researchers and collectors: well-formed crystals are treasured and occasionally cut into gemstones. { Keyboard Yellowish green, Brownish green, Black, Yellow, Gray. Location: Franklin, Sussex County, New Jersey, USA. All Ferric Iron Recalculation of a mineral formula using a fixed number of oxygens per formula. Epidote Mineral Facts: Chemical Formula: Ca 2 (Al-Fe) 3 (OH)(SiO 4) 3 Silicate of aluminum, calcium and iron, with water. B - Bonds On/Off { Many of the characters of the mineral vary with the amount of iron present for instance, the color, the optical constants, and the specific gravity. Clinozoisite is usually lighter in color than epidote because iron is what produces epidote's greenish to brownish color. Regular - Flat surfaces (not cleavage) fractured in a regular pattern. Epidote when … return; Wikipedia Epidote. } Epidote appears in the colour range from yellowish-green to greenish-black. return; }, Valid Species (Pre-IMA) 1899 - Dana # Changed from 58.2.1a.8. This spread sheet converts all iron to Fe+3 for an epidote analysis. . var headTags = document.getElementsByTagName("head"); Mindat.org's Discussion Groups The faces are often deeply striated and crystals are often twinned. © Lou Perloff / Photo Atlas of Minerals, Comments: Colorless, transparent hexagonal prism of nasonite on reddish brown hancockite (epidote-(Pb)). } Scale: Not Given. Named for Elwood P. Hancock (1836-1916), of Berlinton, New Jersey, USA, collector of minerals from Franklin. _uacct = "UA-3067463-1"; Silicon 16.22 % Si 34.71 % SiO 2. html += printReadyElem.innerHTML; Scale: Not Given. if (headTags.length > 0)
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