Strashimirite Mineral Data

Strashimirite Mineral Data +

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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.

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:

MonoclinicSpace 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

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:

r_electron=3.59 gm/cc
note: r_{Strashimirite}=3.80 gm/cc.

Fermion Index

Fermion Index = 0.00015
Boson Index = 0.99985

Photoelectric:

PE_{Strashimirite}= 35.33 barns/electron
U=PE_{Strashimirite} x r_electron= 126.99 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Strashimirite is Not Radioactive

Strashimirite Classification

Dana Class:

42.6.5.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.6)where (AB)2 (XO4) Zq · x(H2O)

(42.6.5)Dana Group

42.6.5.1 Strashimirite Cu8(AsO4)4(OH)4·5(H2O) P 2/m,P 2,Pm Mono

42.6.5.2 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1

Strunz Class:

VII/D.07-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.07 - Nissonite - Euchroite - Spencerite series

VII/D.07-10 Nissonite Cu2Mg2(PO4)2(OH)2·5(H2O) C 2/c 2/m

VII/D.07-20 Strashimirite Cu8(AsO4)4(OH)4·5(H2O) P 2/m,P 2,Pm Mono

VII/D.07-30 Euchroite Cu2(AsO4)(OH)·3(H2O) P 2₁2₁2₁ 2 2 2

VII/D.07-40 Arhbarite Cu2Mg(AsO4)(OH)3 P1 1

VII/D.07-50 Legrandite Zn2(AsO4)(OH)·(H2O) P 2₁/c 2/m

VII/D.07-60 Spencerite Zn4(PO4)2(OH)2·3(H2O) P 2/c 2/m

VII/D.07-70 Nevadaite! (Cu,[],Al,V)6[Al8(PO4)8F8](H2O)23 P 2₁mn 2 2 2

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Strashimirite

Cu8(AsO4)4(OH)4·5(H2O)
Dana No: 42.6.5.1 Strunz No: VII/D.07-20
Locality:

Notes: