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Koksharovite

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Nikolai Ivanovich Koksharov
Formula:
CaMg2Fe3+4(VO4)6
Colour:
yellowish-brown to reddish-brown
Lustre:
Adamantine
Hardness:
Specific Gravity:
3.39 (Calculated)
Crystal System:
Triclinic
Name:
Koksharovite (Cyrillic: kokwapobhq) is named after Professor Nikolay Ivanovich Koksharov (23 November (5 December), 1818 - 21 December (2 January), 1893), Academician of the Russian Academy of Sciences from 1855 and Director of the Russian Mineralogical Society from 1865. Professor Koksharov made the first systematic, extended study of the mineralogy of Russia. His fundamental work Materials for Mineralogy of Russia was published in eleven volumes from 1853 to 1892 in Russian and German. He is also well-known as an author for excellent goniometric measurements of crystals of many minerals that are still valid.
Structurally related to howardevansite and grigorievite.


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Classification of KoksharoviteHide

Approved

Physical Properties of KoksharoviteHide

Adamantine
Transparency:
Translucent
Colour:
yellowish-brown to reddish-brown
Streak:
yellowish-brown
Hardness:
4½ on Mohs scale
Hardness:
VHN20=368 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.39 g/cm3 (Calculated)

Optical Data of KoksharoviteHide

Type:
Anisotropic
Anisotropism:
weak
Bireflectance:
bireflectance is weak
Colour in reflected light:
light grey
Internal Reflections:
distinct, yellow-brown to red
Pleochroism:
Non-pleochroic

Chemical Properties of KoksharoviteHide

Formula:
CaMg2Fe3+4(VO4)6

Crystallography of KoksharoviteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.1758(7) Å, b = 9.8292(9) Å, c = 6.6940(6) Å
α = 105.041(8)°, β = 102.040(8)°, γ = 106.025(8)°
Ratio:
a:b:c = 0.832 : 1 : 0.681
Unit Cell V:
476.02 ų (Calculated from Unit Cell)

Epitaxial Relationships of KoksharoviteHide

Epitaxial Minerals:
ZiminaiteFe3+ 6 (VO4)6

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.47(28)
3.75(44)
3.26(27)
3.17(100)
3.09(94)
2.802(25)
2.039(28)
1.664(25)
Comments:
From Type Description.

Type Occurrence of KoksharoviteHide

General Appearance of Type Material:
equant to prismatic crystals, typically skeletal, up to 30 70 mm (usually from 5 to 15 mm) in size and their groups on the surface of andesite scoria
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4329/1
Geological Setting of Type Material:
Volcanic fumaroles
Associated Minerals at Type Locality:

Synonyms of KoksharoviteHide

Relationship of Koksharovite to other SpeciesHide

Other Members of this group:
GrigorieviteCu3Fe3+2Al2(VO4)6Tric. 1 : P1
HowardevansiteNaCuFe2(VO4)3Tric. 1 : P1
ZiminaiteFe3+ 6 (VO4)6Tric. 1 : P1

Other InformationHide

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

References for KoksharoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Zubkova, N.V., Kartashov, P. M . , Yapask u r t , V.O., Polekhovsky, Y.S. and Pushcharovsky, D.Y. (2013) Koksharovite, IMA 2012-092. CNMNC Newsletter No. 16, August 2013, page 2698; Mineralogical Magazine, 77, 2695-2709.
Pekov, I. V., Zubkova, N. V., Yapaskurt, V. O., Kartashov, P. M., Polekhovsky, Y. S., Murashko, M. N., & Pushcharovsky, D. Y. (2014). Koksharovite, CaMg2Fe3+ 4 (VO4) 6, and grigorievite, Cu3Fe3+ 2Al2 (VO4) 6, two new howardevansite-group minerals from volcanic exhalations. European Journal of Mineralogy, 26, 667–677

Internet Links for KoksharoviteHide

Localities for KoksharoviteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Kamchatka Krai
Pekov, I.V., Zubkova, N.V., Kartashov, P. M . , Yapask u r t , V.O., Polekhovsky, Y.S. and Pushcharovsky, D.Y. (2013) Koksharovite, IMA 2012-092. CNMNC Newsletter No. 16, August 2013, page 2698; Mineralogical Magazine, 77, 2695-2709.
Mineral and/or Locality  
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