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Fedorovskite (Fedorovskit)

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Fedorovskit
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Fedorovskit
braune Partien von Fedorovskit in möglicherweise Kurchatovit, Solongo Bor-Lagerstätte, Vitim Plateau, Burjatien, Russland; BB ~ 1,5 cm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Ferner Osten, Föderationskreis/Burjatien (Buryatia), Republik/Vitim Plateau/Solongo Bor-Lagerstätte
Mineral: Fedorovskite
Image: 1584800275
License: Usage for Mineralienatlas project only
Fedorovskit

braune Partien von Fedorovskit in möglicherweise Kurchatovit, Solongo Bor-Lagerstätte, Vitim Plateau, Burjatien, Russland; BB 1,5 cm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-03-21
Locality: Solongo Bor-Lagerstätte / Vitim Plateau / Burjatien (Buryatia), Republik / Ferner Osten, Föderationskreis / Russland

Collectors Summary

Color braun
Streak color bräunlich
Hardness (Mohs) 4.5
Solubility +++ verdünnte HCl, - H2O
Crystal System orthorhombisch, Pbam

Chemism

Chemical formula

Ca2(Mg,Mn)2B4O7(OH)6

Chemical composition

Calcium, Magnesium, Mangan, Bor, Sauerstoff, Wasserstoff

Unit weight: 401.37048695 u; Number of atoms in the formula: 27

Info

Empirical formula:

Ca2(Mg0.75Mn0.25)2B4O7(OH)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.51

6

22.22

1.0079470

6.0476820

Boron

B

10.77

4

14.81

10.8117000

43.2468000

Oxygen

O

51.82

13

48.15

15.9994300

207.9925900

Magnesium

Mg

9.08

1.5

5.56

24.3050600

36.4575900

Calcium

Ca

19.97

2

7.41

40.0784000

80.1568000

Manganese

Mn

6.84

0.5

1.85

54.9380499

27.4690250

Strunz 9th edition incl. updates

6.DA.25

6: Borate
D: Tetraborate
A: Insel(Neso)-Tetraborate
25:Roweit-Gruppe

Lapis Classification

V/H.11-010

V: NITRATE, CARBONATE UND BORATE
H: Gruppenborate
11: Planare und tetraedrische Gruppen [B3O5] 1- bis [B6O10] 2-

Classification by Hölzel

6.DA.120

6: Borates
D: Tetraborates
A: Nesotetraborates
1: Borax-Group - 4(2P+2T)

Dana 8th edition

25.04.01.02

25: Anhydrous Borates Containing Hydroxyl or Halogen
04: Anhydrous Borates Containing Hydroxyl or Halogen

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

braun

Streak color

bräunlich

max. Birefringence

0.011

Birefringence chart\! Fedorovskite title=Birefringence chart Fedorovskite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.643

RI value β

1.653

RI value γ / ε

1.654

Ri mean

1.650

2V angle

Biaxial (-) 40°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

55

Space Group

Pbam

Cell parameters a (Å)

8.96

Cell parameters b (Å)

13.15

Cell parameters c (Å)

8.15

Cell parameters a/b or c/a

0.681

Cell parameters c/b

0.620

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volumne (ų)

960.266

X-Ray Powder Diffraction

5.29(50),
4.50(50),
3.92(100),
3.25(50),
3.02(70),
2.85(50),
2.59(100),
2.28(60)

XRD chart Fedorovskite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

4.5

VHN (Hardness Vickers)

280 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.71 (gemessen)

2.776 ( ρ calc. Mineralienatlas )

Instability

+++ verdünnte HCl, - H2O

Preface

Author (Name, Year)

Malinko & Shashkin & Yurkina, 1976

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 105 (1976), 71

Other languages

German

Fedorovskit

Spanish

Fedorovskita

English

Fedorovskite

French

Fedorovskite

Russian

Федоровскит

Alternative Name

German

Fedeorovskit

Spanish

Fedeorovskita

Fedeorovskite

CNMNC (IMA)-Number

IMA 1975-006

CNMNC symbol

Symbol

Fdo