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Fedorovskite

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About FedorovskiteHide

Formula:
Ca2Mg2B4O7(OH)6
Colour:
Brown
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.65
Crystal System:
Orthorhombic
Name:
Named for Nikolai Mikhailovich Fedorovskii (1886-1956), Russian crystallographer, mineralogist and founder of the Russian Research Institute of Mineral Resources, Moscow, Russia.
Fedorovskite-Roweite Series. The magnesium analogue of Roweite.


Classification of FedorovskiteHide

Approved
Approval Year:
1975
6.DA.25

6 : BORATES
D : Tetraborates
A : Neso-tetraborates
Dana 7th ed.:
25.4.1.2
25.4.1.2

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
4 : Tetraborates
9.4.2

9 : Borates
4 : Borates of Ca and Mn

Pronounciation of FedorovskiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of FedorovskiteHide

Vitreous
Transparency:
Translucent
Colour:
Brown
Streak:
Pale brown
Hardness:
4½ on Mohs scale
Cleavage:
Perfect
Perfect on {100}
Density:
2.65 g/cm3 (Measured)    2.60 g/cm3 (Calculated)

Optical Data of FedorovskiteHide

Type:
Biaxial (-)
RI values:
nα = 1.619 - 1.623 nβ = 1.627 - 1.632 nγ = 1.629 - 1.634
2V:
Measured: 48°
Max Birefringence:
δ = 0.010 - 0.011
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r
Pleochroism:
Visible
Comments:
X= colorless to pale yellow
Z= yellow to bright yellow

Chemical Properties of FedorovskiteHide

Formula:
Ca2Mg2B4O7(OH)6

Crystallography of FedorovskiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbam
Cell Parameters:
a = 8.96(2) Å, b = 13.15(2) Å, c = 8.15(1) Å
Ratio:
a:b:c = 0.681 : 1 : 0.62
Unit Cell V:
960.27 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic crystals, with rhombic outlines, fibrous aggregates.
Twinning:
Polysynthetic, composition plane {100}

Type Occurrence of FedorovskiteHide

Synonyms of FedorovskiteHide

Other Language Names for FedorovskiteHide

Relationship of Fedorovskite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Kurchatovite3 photos of Fedorovskite associated with Kurchatovite on mindat.org.
Ludwigite2 photos of Fedorovskite associated with Ludwigite on mindat.org.
Frolovite1 photo of Fedorovskite associated with Frolovite on mindat.org.
Szaibélyite1 photo of Fedorovskite associated with Szaibélyite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.DA.10BoraxNa2(B4O5)(OH)4 · 8H2OMon. 2/m : B2/b
6.DA.15TincalconiteNa2(B4O7) · 5H2OTrig. 3 2 : R3 2
6.DA.20HungchaoiteMg(B4O7) · 9H2OTric. 1
6.DA.25RoweiteCa2Mn2+2B4O7(OH)6Orth.
6.DA.30HydrochlorboriteCa4B8O15Cl2 · 21H2OMon.
6.DA.35UralboriteCa2[B3O3(OH)5 · OB(OH)3]Mon.
6.DA.40BorcariteCa4Mg(B4O6(OH)6)(CO3)2Tric.
6.DA.40NumanoiteCa4Cu(B4O6(OH)6)(CO3)2Mon. 2/m : B2/m
6.DA.60Fontarnauite(Na,K)2(Sr,Ca) (SO4)[B5O8(OH)]·2H2OMon. 2/m : P21/b

Related Minerals - Dana Grouping (8th Ed.)Hide

25.4.1.1RoweiteCa2Mn2+2B4O7(OH)6Orth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.4.1RoweiteCa2Mn2+2B4O7(OH)6Orth.

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 FedorovskiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Malinko, S.V., T.I. Stolyarova, and D.P. Shashkin (1972) The first finding of magnesium roweite, its paragenesis and products of replacement. Zap. Vses. Mineral. Obshch., 101, 465–473. [cited in Handbook of Mineralogy]
Moore, P. B., Araki, T. (1974): Roweite, Ca2Mn2+2(OH)4[B4O7(OH)2]: Its atomic arrangement. American Mineralogist 59, 60-65.
Malinko, S.V., D.P. Shashkin, and K.V. Yurkina (1977): Fedorovskite, a new
boron mineral, and the isomorphous series roweite-fedorovskite. Zap. Vses. Mineral. Obshch., 105, 71–85. [abs. in American Mineralogist (1977) 62, 173]
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for FedorovskiteHide

Localities for FedorovskiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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)
 
  • Zabaykalsky Krai
    • Buriatia Republic (Buryatia)
      • Vitim Plateau
Malinko, S.V., T.I. Stolyarova, and D.P. Shashkin (1972) The first finding of magnesium roweite, its paragenesis and products of replacement. Zap. Vses. Mineral. Obshch., 101, 465–473 [cited in Handbook of Mineralogy]; American Mineralogist, Volume 87, pages 1509–1513, 2002; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Mineral and/or Locality  
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