Dashkovaite Mineral Data

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 - PrismaticH-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.

Diaphaniety:

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:

r_electron=2.06 gm/cc
note: r_Dashkovaite=2.00 gm/cc.

Fermion Index

Fermion Index = 0.01742
Boson Index = 0.98258

Photoelectric:

PE_Dashkovaite= 0.54 barns/electron
U=PE_Dashkovaite x r_electron= 1.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Dashkovaite is Not Radioactive

Dashkovaite Classification

Dana Class:

50.2.6.2 (50)Salts of Organic Acids

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

(50.2.6)Dana Group

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

50.2.6.2 Dashkovaite ! Mg(HCOO)2·2(H2O) P 2₁/c 2/m

Strunz Class:

IX/A.02-03 IX - Organic compunds

IX/A - Salts from organic acids. Other organic salts, a.o. mellates and citrates.

IX/A.02 - Mellite - Abelsonite (?) series

IX/A.02-03 Dashkovaite Mg(HCOO)2·2(H2O) P 2₁/c 2/m

IX/A.02-05 Formicaite! Ca(HCOO)2 P 4₁2₁2 4 2 2

IX/A.02-10 Mellite Al2[C6(COO)6]·16(H2O) P 4₁22,P 4₃22 4 2 2

IX/A.02-16 Hoganite! Cu(CH3COO)2·H2O C 2/c 2/m

IX/A.02-18 Paceite! CaCu(CH3COO)4·6(H2O) I 4/m 4/m

IX/A.02-20 Calclacite Ca[Cl2/CH3COO]·10(H2O) P 2₁/a 2/m

IX/A.02-30 Earlandite Ca3(C6H5O7)·4(H2O) Unk Mono

IX/A.02-40 Kafehydrocyanite* K4Fe(CN)6·3(H2O) I 4₁/a 4/m

IX/A.02-50 Julienite* Na2Co(SCN)4·8(H2O) P 4₁/n 4/m

IX/A.02-60 Abelsonite NiC31H32N4 P1 or P1 Tri

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Dashkovaite

Mg(HCOO)2·2(H2O)
Dana No: 50.2.6.2 Strunz No: IX/A.02-03
Locality:

Notes: