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 % As₂O₅

Hydrogen 1.15 % H 10.32 % H₂O

Oxygen 32.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₈(AsO₄)₄(OH)₄•5(H₂O)

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

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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_{Strashimirite}= 35.33 barns/electron
U=PE_{Strashimirite} x rElectron 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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