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Fedorovskite

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Solongo B deposit, Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
© Pavel M. Kartashov

Show Fedorovskite Photos (3)
Formula:
Ca
 
2
(Mg,Mn
2+
 
)
 
2
[(OH)
 
6
|B
 
4
O
 
7
]
System:OrthorhombicColour:Brown
Lustre:VitreousHardness:4½
Name:Named for Nikolai m. Fedeorovskii (1886-1956), Russian mineralogist.


Fedorovskite-Roweite Series. The magnesium analogue of Roweite.

Classification of Fedorovskite

IMA status:Approved 1975
Strunz 8th edition ID:5/H.11-10
Nickel-Strunz 10th (pending) edition ID:6.DA.25

6 : BORATES
D : Tetraborates
A : Neso-tetraborates
Dana 7th edition ID:25.4.1.2
Dana 8th edition ID:25.4.1.2

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
4 : Tetraborates
Hey's CIM Ref.:9.4.2

9 : Borates
4 : Borates of Ca and Mn
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Type Occurrence of Fedorovskite

Type Locality:Solongo B deposit, Vitim Plateau, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
Place of Conservation of Type Material:Fersman

Occurrences of Fedorovskite

Geological Setting:Skarn type boron deposit.

Physical Properties of Fedorovskite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:Brown
Streak:Pale brown
Hardness (Mohs):4½
Cleavage:Perfect
Perfect on {100}
Density (measured):2.65 g/cm3
Density (calculated):2.60 g/cm3

Crystallography of Fedorovskite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbam {P21/b 21/a 2/m}
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 Volume:V 960.27 ų (Calculated from Unit Cell)
Z:4
Morphology:Prismatic crystals, with rhombic outlines, fibrous aggregates.
Twinning:Polysynthetic, composition plane {100}

Optical Data of Fedorovskite

Type:Biaxial (-)
RI values: nα = 1.619 - 1.623 nβ = 1.627 - 1.632 nγ = 1.629 - 1.634
2V:Measured: 48°
Maximum Birefringence:δ = 0.010 - 0.011

Chart 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 Fedorovskite

Formula:
Ca
 
2
(Mg,Mn
2+
 
)
 
2
[(OH)
 
6
|B
 
4
O
 
7
]
Essential elements:B, Ca, H, Mg, O
All elements listed in formula:B, Ca, H, Mg, Mn, O

Relationship of Fedorovskite to other Species

Series:Forms a series with Roweite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
6.DA.10Borax
Na
 
2
[B
 
4
O
 
7
] · 10H
 
2
O
6.DA.15Tincalconite
Na
 
2
[B
 
4
O
 
7
] · 5H
 
2
O
6.DA.20Hungchaoite
Mg[B
 
4
O
 
7
] · 9H
 
2
O
6.DA.25Roweite
Ca
 
2
Mn
2+
2
[(OH)
 
6
|B
 
4
O
 
7
]
6.DA.30Hydrochlorborite
Ca
 
4
B
 
8
O
 
15
Cl
 
2
·21H
 
2
O
6.DA.35Uralborite
Ca
 
2
[B
 
3
O
 
3
(OH)
 
5
·OB(OH)
 
3
]
6.DA.40Borcarite
Ca
 
4
Mg[(CO
 
3
)
 
2
|B
 
4
O
 
6
(OH)
 
6
]
6.DA.40Numanoite
Ca
 
4
Cu[(CO
 
3
)
 
2
|B
 
4
O
 
6
(OH)
 
6
]
Related Minerals - Hey's Index Grouping:

- +
9.4.1Roweite
Ca
 
2
Mn
2+
2
[(OH)
 
6
|B
 
4
O
 
7
]

Other Names for Fedorovskite

Synonyms:
FedeorovskiteIMA1975-006
Other Languages:
German:Fedeorovskit
Fedorovskit
Spanish:Fedeorovskita
Fedorovskita

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 Fedorovskite

Reference List:American Mineralogist (1974): 59: 60-65.

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 Fedorovskite

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    Localities for Fedorovskite

    (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
      • Transbaikalia (Zabaykalye)
        • Buriatia (Buryatia) Republic
          • Vitim Plateau
    		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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