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Strashimirite Mineral Data

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General Strashimirite Information

Help on Chemical  Formula: Chemical Formula: Cu8(AsO4)4(OH)4•5(H2O)
Help on Composition: Composition: Molecular Weight = 1,222.15 gm
   Copper    41.60 %  Cu   52.07 % CuO
   Arsenic   24.52 %  As   37.61 % As2O5
   Hydrogen   1.15 %  H    10.32 % H2O
   Oxygen    32.73 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu8(AsO4)4(OH)4•5(H2O)
Help on Environment: Environment: Secondary copper mineral formed by oxidation of arsenites.
Help on IMA Status: IMA Status: Approved IMA 1968
Help on Locality: Locality: Zapachitsa copper mine, western Stara-Planina, Bulgaria. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Strashimir Dimitrov, Bulgarian petrographer.
Help on Name Pronunciation: Name Pronunciation: Strashimirite + Pronunciation Say STRASHIMIRITE

Strashimirite Image

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Comments: Green, radial sprays of acicular strashimirite crystals on matrix.
Location: Majuba Hill mine, Pershing County, Nevada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Strashimirite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5151:1:0.4742
Help on Cell Dimensions: Cell Dimensions: a = 9.71, b = 18.85, c = 8.94, Z = 3; beta = 97.2° V = 1,623.42 Den(Calc)= 3.75
Help on Crystal System: Crystal System: Monoclinic Space Group: P 2/m,P 2,Pm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.86(1), 18.74(1), 8.97(0.9),

Physical Properties of Strashimirite

Help on Color: Color: White, Green.
Help on Density: Density: 3.8
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: pale green

Optical Properties of Strashimirite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1967,KPDmeas= 0.1941,KC= 0.1845
Ncalc = 1.69 - 1.7
Help on Optical Data: Optical Data: Biaxial (-), a=1.726, b=1.74, g=1.747, bire=0.0210, 2V(Calc)=70, 2V(Meas)=70.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): pale yellow green.
Help on Pleochroism (z): Pleochroism (z): yellow green.

Calculated Properties of Strashimirite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.59 gm/cc
note: Specific Gravity of Strashimirite =3.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001588262
Boson Index = 0.9998411738
Help on Photoelectric: Photoelectric: PEStrashimirite = 35.33 barns/electron
U=PEStrashimirite x rElectron Density= 126.99 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Strashimirite is Not Radioactive

Strashimirite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.06)where (AB)2 (XO4) Zq � x(H2O)
  (42.06.05)Dana Group Strashimirite Cu8(AsO4)4(OH)4•5(H2O) P 2/m,P 2,Pm Mono Arhbarite Cu2Mg(AsO4)(OH)3 P1 1 Attikaite! Ca3Cu2Al2(AsO4)4(OH)4•2H2O Pban, Pbam or Pba2 Ortho
Help on  Strunz Class: Strunz Class: 08.DC.12 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
08.DC.12 Strashimirite Cu8(AsO4)4(OH)4•5(H2O) P 2/m,P 2,Pm Mono

Other Strashimirite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Strashimirite :
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.DC.12





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