https://www.mineral-bosse.de
https://www.mineralbox.biz
https://www.mineraliengrosshandel.com
https://www.edelsteine-neuburg.de
'._('einklappen').'
 

Belkovite

Pictures (1 Images total)

Belkovit auf Dolomit
Views (File:
1240160075
): 1693
Belkovit auf Dolomit
Kristallgröße: 1 mm; Fundort: Vuorijärvi-Massiv, Kola-Halbinsel, Murmansk, Russland
Copyright: Pavel M. Kartashov; Contribution: slugslayer
Collection: Pavel Kartashov, Collection number: 3274
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Vuorijärvi-Massiv (Vuoriyarvi)
Mineral: Belkovite
Image: 1240160075
License: Usage for Mineralienatlas project only
Belkovit auf Dolomit (SNr: 3274)

Kristallgröße: 1 mm; Fundort: Vuorijärvi-Massiv, Kola-Halbinsel, Murmansk, Russland

Collection: Pavel Kartashov
Copyright: Pavel M. Kartashov
Contribution: slugslayer 2009-04-19
Locality: Vuorijärvi-Massiv (Vuoriyarvi) / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color braun
Streak color weiß
Hardness (Mohs) 6.00 - 6.50
Cleavages fehlt
Fracture uneben
Crystal System hexagonal, P62m

Chemism

Chemical formula

Ba3(Nb,Ti)6(Si2O7)2O12

Chemical composition

Barium, Niob, Silicium, Titan, Sauerstoff

Unit weight: 1430.189769 u; Number of atoms in the formula: 39

Info

Empirical formula:

Ba3(Nb0.75Ti0.25)6(Si2O7)2O12

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

29.09

26

66.67

15.9994300

415.9851800

Silicon

Si

7.86

4

10.26

28.0855300

112.3421200

Titanium

Ti

5.02

1.5

3.85

47.8671000

71.8006500

Niobium

Nb

29.23

4.5

11.54

92.9063820

418.0787190

Barium

Ba

28.81

3

7.69

137.3277000

411.9831000

Analysis wt%

Ø K2O : 0.55, BaO : 30.30, Fe2O3 : 1.78, TiO2 : 5.60, ZrO2 : 1.20, Nb2O5 : 42.20, SiO2 : 17.80 (Ref: Neues Jahrbuch für Mineralogie, (Monatshefte) 91)

Strunz 9th edition incl. updates

9.BE.75

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
E: Si2O7 Gruppen mit zusätzlichen Anionen; Kationen in oktahedraler [6] und größerer Koordination
75:Belkovit-Gruppe

Lapis Classification

VIII/C.16-040

VIII: SILIKATE
C: Gruppensilikate

Classification by Hölzel

9.BK.200

9: SILICATES
B: Sorosilicates
K: Perrierite-Group

Dana 8th edition

55.04.03.01

55: Sorosilicate Minerals
04: Sorosilicates Sorosilicate Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

braun

Streak color

weiß

max. Birefringence

0.074

Birefringence chart\! Belkovite title=Birefringence chart Belkovite

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

1.928

RI value γ / ε

2.002

Ri mean

1.953

2V angle

Uniaxial (+)

Crystallography

Crystal System

hexagonal

Class (H-M)

6m2

Space Group number

189

Space Group

P62m

Cell parameters a (Å)

8.966

Cell parameters b (Å)

-

Cell parameters c (Å)

7.799

Cell parameters a/b or c/a

0.870

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

1

Volume (ų)

542.959

X-Ray Powder Diffraction

7.81(30),
3.888(50),
3.481(20),
2.937(100),
2.750(20),
2.590(20),
2.154(20),
1.948(30)

XRD chart Belkovite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.00 - 6.50

VHN (Hardness Vickers)

970 (40g)

Density (g/cm³)

4.16 (gemessen)

4.374 ( ρ calc. Mineralienatlas )

Cleavages

fehlt

Fracture

uneben

Tenacity

spröde

Preface

Author (Name, Year)

Voloshin & Subbotin & Pakhomovskiy & Bakhchisaraitsev & Yamnova & Push

References

Doklady Akademiia Nauk, SSSR (USSR) (in Russian) 315 (1990), 1218

Other languages

German

Belkovit

Spanish

Belkovita

English

Belkovite

French

Belkovite

Russian

Бельковит

CNMNC (IMA)-Number

IMA 1989-053

CNMNC symbol

Symbol

Bkv

IDs

GUSID (Global unique identifier short form) Y-dDJridz0SsS8F1ta1bAA
GUID (Global unique identifier) 2643E763-9DB8-44CF-AC4B-C175B5AD5B00
Database ID 342