Dashkovaite Mineral Data

General Dashkovaite Information

Chemical Formula:

Mg(HCOO)2•2(H2O)

Composition:

Molecular Weight = 172.49 gm

Magnesium 14.09 % Mg

Hydrogen 3.33 % H

Carbon 27.85 % C

Oxygen 54.73 % O

______

100.00 %

Empirical Formula:

MgH_5.72(C₂)O_5.9

Environment:

Found in dolomite marble core. Second natural formate.

IMA Status:

Approved IMA 2000 (Dana # Added)

Locality:

Korshunovskoye boron deposit in the Irkutsk district, Siberia. Link to MinDat.org Location Data.

Name Origin:

Named for E. R. Dashkova (1744-1796), former director of the Saint Petersburg Academy of Sciences.

Synonym:

IMA2000-006

Dashkovaite Image

Images:

Dashkovaite

Comments: White fibrous dashkovaite.
Location: Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Picture size 2.3 mm.
© Thomas Witzke / Abraxas-Verlag

Dashkovaite Crystallography

Axial Ratios:

a:b:c =1.2083:1:1.3118

Cell Dimensions:

a = 8.64, b = 7.15, c = 9.38, Z = 4; beta = 98° V = 573.82 Den(Calc)= 2.00

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3.4(1)(112), 4.9(0.9)(111), 3.68(0.8)(210),4.3(0.7)(200), 4.64(0.7)(002), 2.87(0.4), 3.05(0.4),

Physical Properties of Dashkovaite

Color:

White.

Diaphaneity:

Translucent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1 - Talc

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Dashkovaite

Optical Data:

Biaxial (+), a=1.465, b=1.486, g=1.516, bire=0.0510

Calculated Properties of Dashkovaite

Electron Density:

Bulk Density (Electron Density)=2.06 gm/cc
note: Specific Gravity of Dashkovaite =2.00 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Dashkovaite= 0.54 barns/electron
U=PE_Dashkovaite x rElectron Density= 1.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dashkovaite is Not Radioactive

Dashkovaite Classification

Dana Class:

50.02.06.02 (50)Salts of Organic Acids

(50.02)(Mellitates, Citrates, Cyanates, and Acetates)

(50.02.06)Formicaite Series

50.02.06.01 Formicaite! Ca(HCOO)2 P 4₁2₁2 4 2 2

50.02.06.02 Dashkovaite! Mg(HCOO)2•2(H2O) P 2₁/c 2/m

Strunz Class:

10.AA.10 10 - ORGANIC COMPOUNDS

10.A - Salts of Organic Acids

10.AA -Formates, Acetates, etc.

10.AA.10 Dashkovaite! Mg(HCOO)2•2(H2O) P 2₁/c 2/m

Other Dashkovaite Information

References:

NAME( AmMin, Vol 86, p 1534) PHYS. PROP.(AmMin, Vol 86, p 1534) OPTIC PROP.(AmMin, Vol 86, p 1534)

See Also:

Links to other databases for Dashkovaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Dashkovaite

Mg(HCOO)2•2(H2O)
Dana No: 50.02.06.02 Strunz No: 10.AA.10
Locality:

Notes:

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