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Dashkovaite

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Solongo B deposit, Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
© Thomas Witzke

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Formula:
Mg[HCOO]
 
2
 · 2H
 
2
O
System:MonoclinicColour:White
Lustre:VitreousHardness:1
Name:
For Yekaterina Romanovna Vorontsova-Dashkova (1744-1796), President of the Russian Academy of Sciences.


Magnesium formiate dihydrate.

Classification of Dashkovaite

IMA status:Approved 2000
Strunz 8th edition ID:9/A.02-03
Nickel-Strunz 10th (pending) edition ID:10.AA.10

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
Dana 7th edition ID:50.2.4.1
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Type Occurrence of Dashkovaite

Type Locality:Korshunovskoye (Korzunovskoe; Korzhunovska; Korshunovskiy) Iron mine, Irkutskaya Oblast', Prebaikalia (Pribaikal'e), Eastern-Siberian Region, Russia
Geological Setting of type material:Hydrothermal veinlets in serpentine in dolomitic marble

Physical Properties of Dashkovaite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:White
Streak:White
Hardness (Mohs):1
Tenacity:Sectile
Fracture:Irregular/Uneven
Density (calculated):1.74 g/cm3

Crystallography of Dashkovaite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
Space Group Setting:P21/c
Cell Parameters:a = 8.64(1) Å, b = 7.15(1) Å, c = 9.38(1) Å
β = 98°
Ratio:a:b:c = 1.208 : 1 : 1.312
Unit Cell Volume:V 573.82 ų (Calculated from Unit Cell)
Z:4
Morphology:Fibrous, in porous aggregates
Comment:Space group by analogy to synthetic

Optical Data of Dashkovaite

Type:Biaxial (+)
RI values: nα = 1.465 nβ = 1.486 nγ = 1.516
2V:Calculated: 81°
Maximum Birefringence:δ = 0.051

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v strong

Chemical Properties of Dashkovaite

Formula:
Mg[HCOO]
 
2
 · 2H
 
2
O
Essential elements:C, H, Mg, O
All elements listed in formula:C, H, Mg, O

Relationship of Dashkovaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
10.AA.05Formicaite
Ca[HCOO]
 
2
10.AA.20Acetamide
CH
 
3
CONH
 
2
10.AA.25Calclacite
Ca[Cl|CH
 
3
COO] · 5H
 
2
O
10.AA.30Paceite
CaCu(CH
 
3
COO)
 
4
·6H
 
2
O
10.AA.35Hoganite
Cu(CH
 
3
COO)
 
2
·H
 
2
O

Other Names for Dashkovaite

Synonyms:
IMA2000-006
Other Languages:
German:Dashkovait
Russian:Дашковаит
Spanish:Dashkovaita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Dashkovaite

Reference List:Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 129(6): 49-53.

Internet Links for Dashkovaite

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    Localities for Dashkovaite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Russia
     
    • Eastern-Siberian Region
      • Prebaikalia (Pribaikal'e)
        • Irkutskaya Oblast'
    		[ZVMO 129/6 (2000), 49; MinRec 32:500]
      • Transbaikalia (Zabaykalye)
        • Buriatia (Buryatia) Republic
          • Vitim Plateau
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