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Koashvite

Pictures (1 Images total)

Koashvit
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1579428037
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Koashvit
gelber, tafeliger Koashvit neben braunem Lomonosovit, Rasvumchorr, Chibiny, Murmansk Oblast, Russland; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Chibiny (Khibiny)/Rasvumchorr
Mineral: Koashvite
Image: 1579428037
License: Usage for Mineralienatlas project only
Koashvit

gelber, tafeliger Koashvit neben braunem Lomonosovit, Rasvumchorr, Chibiny, Murmansk Oblast, Russland; BB < 1 mm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-01-19
Locality: Rasvumchorr / Chibiny (Khibiny) / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color bräunlichgelb, hellgelb
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 6
Crystal System orthorhombisch, Pmnb
Morphology Abgeplattete Aggregate

Chemism

Chemical formula

Na6(Ca,Mn)(Ti,Fe)Si6O18·H2O

Chemical composition

Calcium, Eisen, Mangan, Natrium, Silicium, Titan, Sauerstoff, Wasserstoff

Unit weight: 706.111802675 u; Number of atoms in the formula: 35

Info

Empirical formula:

Na6(Ca0.75Mn0.25)(Ti0.75Fe0.25)Si6O18·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.29

2

5.71

1.0079470

2.0158940

Oxygen

O

43.05

19

54.29

15.9994300

303.9891700

Sodium

Na

19.53

6

17.14

22.9897702

137.9386212

Silicon

Si

23.86

6

17.14

28.0855300

168.5131800

Calcium

Ca

4.26

0.75

2.14

40.0784000

30.0588000

Titanium

Ti

5.08

0.75

2.14

47.8671000

35.9003250

Manganese

Mn

1.95

0.25

0.71

54.9380499

13.7345125

Iron

Fe

1.98

0.25

0.71

55.8452000

13.9613000

Analysis wt%

Ø SiO2 : 50.50, TiO2 : 4.76, Nb2O5 : 0.40, Fe2O3 : 4.94, MnO : 4.27, CaO : 6.67, Na2O : 26.30, H2O : 1.68 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 74)

Strunz 9th edition incl. updates

9.CJ.20

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
J: ~[Si6O18]12- sechser-Einfachringe, ohne inselartig, komplexe [Anionen]
20:Imandrit-Gruppe

Lapis Classification

VIII/E.16-050

VIII: SILIKATE
E: Ringsilikate
16: Sechserringe [Si6O18] 12-; Lovozerit-Gruppe

Classification by Hölzel

9.CD.300

9: SILICATES
C: Cyclosilicates
D: ~[Si6O18]-rings, without borate
3: Koashvite-Imandrite-Subgroup

Dana 8th edition

61.01.02b.02

61: Cyclosilicates Cyclosilicate Six-Membered Rings
01: Cyclosilicates Cyclosilicate Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution
02b: Lovozerite group (Ortho and MON subgroup)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Lovozerite group  ⇒ Koashvite subgroup

Optical Properties

Color

bräunlichgelb, hellgelb

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.011

Birefringence chart\! Koashvite title=Birefringence chart Koashvite

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

1.637

RI value β

1.643

RI value γ / ε

1.648

Ri mean

1.643

2V angle

Biaxial (-) 83°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mmm

Space Group number

62

Space Group

Pmnb

Cell parameters a (Å)

10.179

Cell parameters b (Å)

20.899

Cell parameters c (Å)

7.335

Cell parameters a/b or c/a

0.487

Cell parameters c/b

0.351

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

4

Volume (ų)

1560.381

X-Ray Powder Diffraction

3.66(50),
3.57(20),
3.28(50),
2.620(40),
2.581(100),
1.820(70),
1.755(30),
1.294(40)

XRD chart Koashvite

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

Morphology

Abgeplattete Aggregate

Physical Properties

Hardness (Mohs)

6

VHN (Hardness Vickers)

710 (20g)

Density (g/cm³)

2.98 - 3.02 / Durchschnittlich = 3

3.006 ( ρ calc. Mineralienatlas )

Preface

Occurrences

In sehr schmalen Gängen der Alkalipegmatite des Mt. Koashva, Chibiny-Massiv, Kola Halbinsel, Russland, meist als Umsetzungsprodukt von Lomonosovit

Associations

Pektolith, Villiaumit, Natrophosphat, Lomonosovit

Rareness

sehr selten

Author (Name, Year)

Kapustin & Pudovkina & Bykova & Lyubomilova, 1974

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 103 (1974), 559

IMA group assignments

Other languages

German

Koashvit

Spanish

Koashvita

French

Koashvite

English

Koashvite

Russian

Коашвит

CNMNC (IMA)-Number

IMA 1973-026

CNMNC symbol

Symbol

Koa

Locations with GPS information

IDs

GUSID (Global unique identifier short form) Tru-0FY2dUyB6Q1KNh9Z1Q
GUID (Global unique identifier) D0BEBB4E-3656-4C75-81E9-0D4A361F59D5
Database ID 2000