Epidote Mineral Data + Say EPIDOTE

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General Epidote Information
Help on Chemical Formula: Chemical Formula: Ca2(Fe+++,Al)3(SiO4)3(OH) = Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH)
Help on Composition: Composition: Molecular Weight = 519.30 gm
   Calcium   15.44 %  Ca   21.60 % CaO
   Aluminum   3.90 %  Al    7.36 % Al2O3
   Iron      24.20 %  Fe   34.60 % Fe2O3
   Silicon   16.22 %  Si   34.71 % SiO2
   Hydrogen   0.19 %  H     1.73 % H2O
   Oxygen    40.05 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Fe3+2.25Al0.75(SiO4)3(OH)
Help on Environment: Environment: Contact metamorphic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1801
Help on Locality: Locality: Common world wide. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek epidosis - "addition."
Help on Synonym: Synonym: ICSD 10268
  PDF 45-1446
  Pistacite - pistachio green
 

Epidote Image

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Epidote

Comments: Dark green, blocky epidote with transparent quartz.
Location: Copper Mt., Prince of Wales, Alaska. Scale: 7 x 5 cm.
© Fabre Minerals

Epidote Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.5921:1:1.812
Help on Cell Dimensions: Cell Dimensions: a = 8.98, b = 5.64, c = 10.22, Z = 2; beta = 115.4° V = 467.58 Den(Calc)= 3.69
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.68(1), 2.9(1), 2.69(0.7),
Help on Forms: Forms:

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Forms: [ 1 0 0] [ -1 1 1] [ 1 1 1] [ 0 0 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.
Click Here for Large Epidote Structure Window Crystal Structure:

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Ito T , American Mineralogist , 32 (1947) p.309-321, The structure of epidote (HCa2(Al,Fe)Al2Si3O13)

View Additional jPOWD Structure files for Epidote
[1] [2] [3] [4]
 

Physical Properties of Epidote

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Yellowish green, Brownish green, Black, Yellow, Gray.
Help on Density: Density: 3.3 - 3.6, Average = 3.45
Help on Diaphaniety: Diaphaniety: Transparent to translucent to opaque
Help on Fracture: Fracture: Regular - Flat surfaces (not cleavage) fractured in a regular pattern.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 7 - Quartz
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: grayish white
 

Optical Properties of Epidote

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.118 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.175 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2042,KPDmeas= 0.2184,KC= 0.2477
Help on Optical Data: Optical Data: 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. Dispersion strong, r > v.
Help on Pleochroism (x): Pleochroism (x): colorless, pale green, or pale yellow.
Help on Pleochroism (y): Pleochroism (y): greenish yellow, greenish brown, or greenish yellow.
Help on Pleochroism (z): Pleochroism (z): pale green, yellow green, or pale green.
 

Calculated Properties of Epidote

Help on Electron Density: Electron Density:

relectron=3.39 gm/cc
note: rEpidote =3.45 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0131
Boson Index = 0.9869
Help on Photoelectric: Photoelectric:

PEEpidote = 9.83 barns/electron
U=PEEpidote x relectron= 33.35 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Epidote is Not Radioactive
 

Epidote Classification
Help on Dana Class: Dana Class: 58.2.1a.7 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.2)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.2.1a)Epidote group (Epidote subgroup)
 
58.2.1a.1 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 21/m 2/m
 
58.2.1a.2 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.2.1a.3 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 21/m 2/m
 
58.2.1a.4 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.2.1a.5 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 21/m 2/m
 
58.2.1a.6 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 21/m 2/m
 
58.2.1a.7 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.2.1a.8 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.2.1a.9 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 21/m 2/m
 
58.2.1a.10 Mukhinite Ca2Al2V(SiO4)3(OH) P 21/m 2/m
 
58.2.1a.11 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.2.1a.12 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.2.1a.13 Androsite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
58.2.1a.14 Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 21/m 2/m
 
58.2.1a.15 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 21/m 2/m
 
58.2.1a.16 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 21/a 2/m
 
58.2.1a.17 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 21/m 2/m
 
58.2.1a.18 Vastmanlandite-(Ce)! Ce3CaMg2Al2Si5O19(OH)2F P 21/m 2/m
 
58.2.1a.19 IMA2002-049! (Mn,Ca)(Ce,REE)AlMnMn(Si2O7)(SiO4)O(OH) P 21/m 2/m
 
58.2.1a.20 Dissakisite-(La)! (Ca,Fe,Th)(REE,Ca)(Al,Cr,Ti)2(Mg,Fe,Al)Si3O12(OH,F)withLa>Ce P 21/m 2/m
 
58.2.1a.22 IMA2004-015! (Mn,Ca)(REE)VAlMn(Si2O7)(SiO4)O(OH) P 21/m 2/m
Help on Strunz Class: Strunz Class: VIII/C.23-20 VIII - Silicates
  VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups
  VIII/C.23 - Epidote group
 
VIII/C.23-10 Clinozoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
VIII/C.23-20 Epidote Ca2(Fe,Al)3(SiO4)3(OH)=Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
VIII/C.23-30 Piemontite Ca2(Al,Mn,Fe)3(SiO4)3(OH)=Ca2(Mn,Fe)Al2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
VIII/C.23-40 Strontiopiemontite (Ca,Mn)(Sr,Ca)Mn(Al,Mn,Fe)2(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
VIII/C.23-43 Niigataite! CaSrAl3(Si2O7)(SiO4)O(OH) P 21/m 2/m
 
VIII/C.23-45 Tweddillite! CaSr(Mn,Fe)2Al[Si3O12](OH) P 21/m 2/m
 
VIII/C.23-50 Mukhinite Ca2Al2V(SiO4)3(OH) P 21/m 2/m
 
VIII/C.23-52 Androsite-(La)! (Mn,Ca)(La,Ce,Ca,Nd)AlMnMn(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
VIII/C.23-55 Dollaseite-(Ce) CaCeMg2AlSi3O11(OH,F)2 P 21/m 2/m
 
VIII/C.23-58 Dissakisite-(Ce) Ca(Ce,REE)(Mg,Fe)(Al,Fe)2Si3O12(OH) P 21/m 2/m
 
VIII/C.23-60 Allanite-(Y) (Y,Ce,Ca)2(Al,Fe)3(SiO4)3(OH) P 21/m 2/m
 
VIII/C.23-65 Allanite-(La)! Ca(REE,Ca)Al2(Fe,Fe)(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
VIII/C.23-80 Allanite-(Ce) (Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH) P 21/m 2/m
 
VIII/C.23-85a Ferriallanite-(Ce)! CaCe(Fe,Fe,Al)3[SiO4][Si2O7]O(OH) P 21/m 2/m
 
VIII/C.23-85 Khristovite-(Ce) (Ca,REE)(Ce,REE)(Mg,Fe,Cr,Ti,V,Al)MnAl(SiO4)(Si2O7)(OH)(F,O) P 21/m 2/m
 
VIII/C.23-87 Gatelite-(Ce)! (Ca,Ce,La,Nd)4(Al,Mg,Fe)4[Si2O7][SiO4]3(O,F,OH)3 P 21/a 2/m
 
VIII/C.23-90 Hancockite (Ca,Pb,Sr)2(Al,Fe)3(SiO4)(Si2O7)O(OH) P 21/m 2/m
 
VIII/C.23-100 Zoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) Pnmc 2/m 2/m 2/m
 

Other Epidote Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Epidote :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - CalTech Mineral Spectroscopy 8 - Crocoite.com Mineral Locations 9 - EUROmin Project 10 - Franklin Minerals(Dunn) 11 - Franklin Minerals(Palache) 12 - Glendale Community College 13 -Google Images 14 -Google Scholar 15 -Handbook of Mineralogy (MinSocAm) 16 -Handbook of Mineralogy (UofA) 17 - HyperPhysics 18 -MinDAT 19 -MinMax(Deutsch) 20 -MinMax(English) 21 -Mineralienatlas (Deutsch) 22 - Minerals in Thin Section-University of North Carolina 23 -Minerals in Thin Sections-Humboldt State 24 - Minerals of Wisconsin 25 - Philatelic Mineralogy 26 -QUT Mineral Atlas 27 - Scandinavian mineral gallery 28 - Thin Sections - Brock University 29 - Tradeshop.com - The Rainbow of Gems 30 - UCLA - Petrography Thin-Sections 31 -University of Colorado - Mineral Structure Data 32 -University of Minnesota 33 - WWW-MINCRYST 34 - YupRocks 35 -theimage 36 -École des Mines de Paris

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Epidote

Ca2(Fe+++,Al)3(SiO4)3(OH) = Ca2(Fe,Al)Al2(SiO4)(Si2O7)O(OH)
Dana No: 58.2.1a.7 Strunz No: VIII/C.23-20
Locality:

 

Notes:

 
 
   
 
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