Zoisite Mineral Data + Say ZOISITE

General Zoisite Information
Help on Chemical Formula: Chemical Formula: Ca2Al3(SiO4)3(OH) = Ca2AlAl2(SiO4)(Si2O7)O(OH)
Help on Composition: Composition: Molecular Weight = 454.36 gm
   Calcium   17.64 %  Ca   24.68 % CaO
   Aluminum  17.82 %  Al   33.66 % Al2O3
   Silicon   18.54 %  Si   39.67 % SiO2
   Hydrogen   0.22 %  H     1.98 % H2O
   Oxygen    45.78 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2Al3Si3O12(OH)
Help on Environment: Environment: Metamorphic and pegmatite rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1805
Help on Locality: Locality: Rauris and Saualpe, Austria. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Austrian natural scientist, Siegmund Zois (1747-1819).
Help on Synonym: Synonym: Anyolite - green
  ICSD 66924
  PDF 13-562
  Tanzanite - blue
  Thulite - red
 

Zoisite Image

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Zoisite

Comments: Gem quality crystal of zoisite with the striking pleochroism displayed in three different views.
Location: Alchuri Village, Shigar Valley, north of Skardu, Baltistan, Pakistan. Scale: 1x1x3.8 cm.
© Dan Weinrich
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Zoisite

Comments: Dual views of a large crystal of blue-violet zoisite (var. tanzanite) showing the pleochroism.
Location: Merelani Hills, Umba Valley, Lelatema Mts., Arusha Region, Tanzania. Scale: 35 mm 42.32 ct.
© John Betts - Fine Minerals

Zoisite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =2.9103:1:1.81
Help on Cell Dimensions: Cell Dimensions: a = 16.24, b = 5.58, c = 10.1, Z = 4; V = 915.25 Den(Calc)= 3.30
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.69(1), 2.87(0.65), 4.03(0.5),
Help on Forms: Forms:

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

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Dollase W A , American Mineralogist , 53 (1968) p.1882-1898, Refinement and comparison of the structures of zoisite and clinozoisite

View Additional jPOWD Structure files for Zoisite
[1] [2] [3] [4] [5] [6]
 

Physical Properties of Zoisite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Gray, Apple green, Brown, Blue, Rose red.
Help on Density: Density: 3.3
Help on Diaphaniety: Diaphaniety: Transparent to subtranslucent
Help on Fracture: Fracture: Even - Flat surfaces (not cleavage) fractured in an even pattern.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Zoisite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2128,KPDmeas= 0.2128,KC= 0.2108
Help on Optical Data: Optical Data: Biaxial (+), a=1.696-1.7, b=1.696-1.702, g=1.702-1.718, bire=0.0060-0.0180, 2V(Calc)=0-40, 2V(Meas)=0-70. Dispersion relatively strong.
Help on Pleochroism (x): Pleochroism (x): colorless or pale pink.
Help on Pleochroism (y): Pleochroism (y): colorless or colorless.
Help on Pleochroism (z): Pleochroism (z): colorless or yellow.
 

Calculated Properties of Zoisite

Help on Electron Density: Electron Density:

relectron=3.28 gm/cc
note: rZoisite =3.30 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00911
Boson Index = 0.99089
Help on Photoelectric: Photoelectric:

PEZoisite = 3.40 barns/electron
U=PEZoisite x relectron= 11.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zoisite is Not Radioactive
 

Zoisite Classification
Help on Dana Class: Dana Class: 58.2.1b.1 (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)
  (58.2.1b)Epidote group (Zoisite subgroup)
 
58.2.1b.1 Zoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) Pnmc 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: VIII/C.23-100 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 Zoisite 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 Zoisite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - CalTech Mineral Spectroscopy 6 - EUROmin Project 7 - Franklin Minerals(Palache) 8 - Glendale Community College 9 -Google Images 10 -Google Scholar 11 -Handbook of Mineralogy (MinSocAm) 12 -Handbook of Mineralogy (UofA) 13 - HyperPhysics 14 -MinDAT 15 -MinMax(Deutsch) 16 -MinMax(English) 17 -Mineralienatlas (Deutsch) 18 - Minerals of Wisconsin 19 - Philatelic Mineralogy 20 -QUT Mineral Atlas 21 - Scandinavian mineral gallery 22 - Tradeshop.com - The Rainbow of Gems 23 - UCLA - Petrography Thin-Sections 24 -University of Colorado - Mineral Structure Data 25 - WWW-MINCRYST 26 -École des Mines de Paris

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Zoisite

Ca2Al3(SiO4)3(OH) = Ca2AlAl2(SiO4)(Si2O7)O(OH)
Dana No: 58.2.1b.1 Strunz No: VIII/C.23-100
Locality:

 

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