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Theisite Mineral Data

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General Theisite Information

Help on Chemical  Formula: Chemical Formula: Cu5Zn5[(As+++++,Sb+++++)O4]2(OH)14
Help on Composition: Composition: Molecular Weight = 1,184.04 gm
   Zinc      27.61 %  Zn   34.37 % ZnO
   Copper    26.83 %  Cu   33.59 % CuO
   Antimony   5.14 %  Sb    6.83 % Sb2O5
   Arsenic    9.49 %  As   14.56 % As2O5
   Hydrogen   1.19 %  H    10.65 % H2O
   Oxygen    29.73 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu5Zn5(AsO4)1.5(SbO4)0.5(OH)14
Help on Environment: Environment: Found in a uranium prospect.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Durango, La Plata, County, Colorade, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Nicholas J. Theis, Geologist, Bendix Corp., who discovered the orignal sample.
Help on Name Pronunciation: Name Pronunciation: Theisite Say THEISITE

Theisite Image

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Comments: Pale blue pearly theisite scattered on matrix.
Location: Grand Junction, Mesa County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Theisite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1547:1:2.1016
Help on Cell Dimensions: Cell Dimensions: a = 8.225, b = 7.123, c = 14.97, Z = 2; V = 877.04 Den(Calc)= 4.48
Help on Crystal System: Crystal System: Orthorhombic Space Group: pseudo-HEX
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.741(1), 2.534(0.9), 14.973(0.9),

Physical Properties of Theisite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Blue green, Green.
Help on Density: Density: 4.3
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 1.5 - Between Talc and Gypsum

Optical Properties of Theisite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.048 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.173,KPDmeas= 0.1802,KC= 0.1817
Ncalc = 1.78 - 1.81
Help on Optical Data: Optical Data: Biaxial (-), a=1.755, b=1.785, g=1.785, bire=0.0300, 2V(Calc)=0, 2V(Meas)=0.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.

Calculated Properties of Theisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.07 gm/cc
note: Specific Gravity of Theisite =4.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETheisite = 48.41 barns/electron
U=PETheisite x rElectron Density= 196.91 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Theisite is Not Radioactive

Theisite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.01)where (A++)m (XO4)p Zq, with m:p>4:1
  (41.01.02)Dana Group Theisite Cu5Zn5[(As,Sb)O4]2(OH)14 pseudo-HEX Ortho Sabelliite! Cu2Zn(As,Sb)O4(OH)3 P 3 3
Help on  Strunz Class: Strunz Class: 08.BE.75 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1
08.BE.75 Theisite Cu5Zn5[(As,Sb)O4]2(OH)14 pseudo-HEX Ortho

Other Theisite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Theisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.BE.75





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