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Zoisite Mineral Data

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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 Name Pronunciation: Name Pronunciation: Zoisite Say ZOISITE
Help on Synonym: Synonym: Anyolite - green
  ICSD 66924
  PDF 13-562
  Tanzanite - blue
  Thulite - red

Zoisite Image

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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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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 - Dipyramidal H-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:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 0 0) ( 1 1 1) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.


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 Diaphaneity: Diaphaneity: 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: Non-fluorescent.
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
Ncalc = 1.7
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.

Calculated Properties of Zoisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Zoisite =3.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0091183238
Boson Index = 0.9908816762
Help on Photoelectric: Photoelectric: PEZoisite = 3.40 barns/electron
U=PEZoisite x rElectron Density= 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: 58.02.01b.01 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)
  (58.02.01b)Epidote group (Zoisite subgroup)
58.02.01b.01 Zoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) Pnmc 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BG.10 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;
09.BG.10 Zoisite Ca2Al3(SiO4)3(OH)=Ca2AlAl2(SiO4)(Si2O7)O(OH) Pnmc 2/m 2/m 2/m

Other Zoisite Information

Help on See Also: See Also: Links to other databases for Zoisite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - CalTech Mineral Spectroscopy
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - Franklin Minerals(Palache)
8 - GeoScienceWorld
9 - Glendale Community College
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - HyperPhysics
15 - MinDAT
16 - Mineralienatlas (Deutsch)
17 - Online Mineral Museum
18 - Philatelic Mineralogy
19 - QUT Mineral Atlas
20 - Ruff.Info
21 - Scandinavian mineral gallery
22 - Tradeshop.com - The Rainbow of Gems
23 - UCLA - Petrography Thin-Sections
24 - University of Colorado - Mineral Structure Data

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Print or Cut-and-Paste your Zoisite Specimen Label here :


Ca2Al3(SiO4)3(OH) = Ca2AlAl2(SiO4)(Si2O7)O(OH)
Dana No: 58.02.01b.01 Strunz No: 09.BG.10





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