Strashimirite Mineral Data
General Strashimirite Information
Chemical Formula:
Cu8(AsO4)4(OH)4•5(H2O)
Composition:
Molecular Weight = 1,222.15 gm
Copper 41.60 % Cu 52.07 % CuO
Arsenic 24.52 % As 37.61 % As2 O5
Hydrogen 1.15 % H 10.32 % H2 O
Oxygen 32.73 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Cu8 (AsO4 )4 (OH)4 •5(H2 O)
Environment:
Secondary copper mineral formed by oxidation of arsenites.
IMA Status:
Approved IMA 1968
Locality:
Zapachitsa copper mine, western Stara-Planina, Bulgaria. Link to MinDat.org Location Data.
Name Origin:
Named after Strashimir Dimitrov, Bulgarian petrographer.
Name Pronunciation:
Strashimirite + Pronunciation
Strashimirite Image
Images:
Strashimirite Crystallography
Axial Ratios:
a:b:c =0.5151:1:0.4742
Cell Dimensions:
a = 9.71, b = 18.85, c = 8.94, Z = 3; beta = 97.2° V = 1,623.42 Den(Calc)= 3.75
Crystal System:
Monoclinic Space Group: P 2/m,P 2,Pm
X Ray Diffraction:
By Intensity(I/Io ): 2.86(1), 18.74(1), 8.97(0.9),
Physical Properties of Strashimirite
Color:
White, Green.
Density:
3.8
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Encrustations - Forms crust-like aggregates on matrix.
Habit:
Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Habit:
Fibrous - Crystals made up of fibers.
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Greasy (Oily)
Streak:
pale green
Optical Properties of Strashimirite
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
Optical Data:
Biaxial (-), a=1.726, b=1.74, g=1.747, bire=0.0210, 2V(Calc)=70, 2V(Meas)=70.
Pleochroism (x):
none.
Pleochroism (y):
pale yellow green.
Pleochroism (z):
yellow green.
Calculated Properties of Strashimirite
Electron Density:
Bulk Density (Electron Density)=3.59 gm/cc note: Specific Gravity of Strashimirite =3.80 gm/cc.
Fermion Index:
Fermion Index = 0.0001588262 Boson Index = 0.9998411738
Photoelectric:
PEStrashimirite = 35.33 barns/electronU=PEStrashimirite x r Electron Density= 126.99 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Strashimirite is Not Radioactive
Strashimirite Classification
Dana Class:
42.06.05.01 (42) Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.06) where (AB)2 (XO4) Zq � x(H2O)
(42.06.05) Dana Group
42.06.05.01 Strashimirite Cu8(AsO4)4(OH)4•5(H2O) P 2/m,P 2,Pm Mono
42.06.05.02 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1
42.06.05.03 Attikaite ! Ca3Cu2Al2(AsO4)4(OH)4•2H2O Pban, Pbam or Pba2 Ortho
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
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
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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Strashimirite
Cu8(AsO4)4(OH)4•5(H2O)
Dana No: 42.06.05.01 Strunz No: 08.DC.12
Locality:
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