Strashimirite Mineral Data

Advertisment

For more than thirty (30) years, Excalibur Mineral Corp. has been providing private collectors, researchers, major universities and museums throughout the world with reliably identified, rare and unusual mineral samples for science an

A Bijoux.com is an online store specialized in the sale on the internet of precious stones , gems , minerals and jewels for individuals and professionals

Weinrich Minerals, A Dealer in Fine Mineral Specimens - Since 1989. We buy collections and single high quality specimens.

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

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:

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
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

Search for Strashimirite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Strashimirite :

A Bijoux Google Search for Strashimirite
Adam's Minerals Google Search for Strashimirite
Cape Minerals Google Search for Strashimirite
Dakota Matrix Minerals Google Search for Strashimirite
Excalibur Mineral Corp. Google Search for Strashimirite
Exceptional Minerals Google Search for Strashimirite
John Betts Fine Minerals Search for Strashimirite
McDougall Minerals Google Search for Strashimirite
Mineral News Website Link
Rock and Mineral Shows Google Search for Strashimirite
Weinrich Minerals, Inc. Google Search for Strashimirite

Ask about Strashimirite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Strashimirite Specimen Label here :

Strashimirite

Cu8(AsO4)4(OH)4•5(H2O)
Dana No: 42.06.05.01 Strunz No: 08.DC.12
Locality:

Notes: