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Gjerdingenite-Ca

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Gjerdingenit-Ca
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Gjerdingenit-Ca
beige nadelige Gjerdingenit-Ca, Pegmatit Nr. 61, Karnasurt, Lovozero, Kola-Halbinsel, Russland; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Karnasurt, Berg/Pegmatit Nr. 61
Mineral: Gjerdingenite-Ca
Image: 1578419118
License: Usage for Mineralienatlas project only
Gjerdingenit-Ca

beige nadelige Gjerdingenit-Ca, Pegmatit Nr. 61, Karnasurt, Lovozero, Kola-Halbinsel, Russland; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-01-07
Locality: Pegmatit Nr. 61 / Karnasurt, Berg / Lovozero / Kola-Halbinsel / Murmansk, Oblast / Nordwestrussland, Föderationskreis / Russland

Collectors Summary

Color weiß oder Pseudomorphose blass-bis rosabraun
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5
Cleavages keine
Fracture uneben
Crystal System monoklin,

Chemism

Chemical formula

K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4·6H2O

Additional chem. information

Labuntsovit Gruppe

Chemical composition

Calcium, Niob, Silicium, Titan, Kalium, Sauerstoff, Wasserstoff

Unit weight: 1226.629437 u; Number of atoms in the formula: 62

Info

Empirical formula:

K2Ca(Nb0.75Ti0.25)4(Si4O12)2(O0.75(OH)0.25)4·6H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

1.07

13

20.97

1.0079470

13.1033110
Oxygen

O

44.35

34

54.84

15.9994300

543.9806200
Silicon

Si

18.32

8

12.90

28.0855300

224.6842400
Potassium

K

6.37

2

3.23

39.0983100

78.1966200
Calcium

Ca

3.27

1

1.61

40.0784000

40.0784000
Titanium

Ti

3.90

1

1.61

47.8671000

47.8671000
Niobium

Nb

22.72

3

4.84

92.9063820

278.7191460

Analysis wt%

Ø SiO2 : 39.29, Nb2O5 : 27.34, TiO2 : 9.96, MnO : 0.84, CaO : 3.56, SrO : 3.47, BaO : 1.04, Na2O : 1.14, K2O : 3.61, H2O : 9.23 (Ref: Canadian Mineralogist 2007)

Strunz 9th edition incl. updates

9.CE.30

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
E: [Si4O12]8- vierer-Einfachringe, ohne inselartige komplexe [Anionen]
30:Labuntsovit-Gruppe

Lapis Classification

VIII/E.07-085

VIII: SILIKATE
E: Ringsilikate
7: Viererringe [Si4O12] 8-; Labuntsovit-Gruppe

Classification by Hölzel

9.CB.561

9: SILICATES
C: Cyclosilicates
B: ~[Si4O12]8-, ~[Si4O10]4--Rings
5: Labuntsovite-Subgroup - Monoclinic, c=~~8

IMA status

anerkannt 2005

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Labuntsovite supergroup  ⇒ Kuzmenkoite group

Optical Properties

Color

weiß oder Pseudomorphose blass-bis rosabraun

Streak color

weiß

Diaphaneity (Transparency)

Körner transparent, Aggregate opak

Lustre

Glasglanz

max. Birefringence

0.082
Birefringence chart\! Gjerdingenite-Ca title=Birefringence chart Gjerdingenite-Ca

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

1.680

RI value β

1.682

RI value γ / ε

1.762

Ri mean

1.708

2V angle

Biaxial (+) 25°

Pleochroism

schwach bei rosabrauner Varietät, von X=Z= farblos nach Y= blass gelblich

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Cell parameters a (Å)

14.637

Cell parameters b (Å)

14.205

Cell parameters c (Å)

7.892

Cell parameters a/b or c/a

1.030

Cell parameters c/b

0.556

Cell parameters α

90°

Cell parameters β

117.47

Cell parameters γ

90°

Z

2

Volumne (ų)

1455.887

X-Ray Powder Diffraction

7.100 (100), 6.999(88), 6.476(38), 4.985(78), 3.252(42), 3.246(43), 3.167(46), 3.140(36)

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.79 gemessen

2.798 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

uneben

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Russland/Nordwestrussland, Föderationskreis/Murmansk, Oblast/Kola-Halbinsel/Lovozero/Karnasurt, Berg/Pegmatit Nr. 61

Preface

Name from

chemischer Zusammensetzung mit Calcium und der kristallchemischen Verwandschaft mit Gjerdingenit-Fe undGjerdingenit-Mn

References

Mineralien Welt 04/08, Steffen Jahn, Die neuen Mineralien 2007 - 2008

IMA group assignments

Other languages

German

Gjerdingenit-Ca

English

Gjerdingenite-Ca

Russian

Гьердингенит-Ca

Simplified Chinese

钙耶尔丁根石

CNMNC (IMA)-Number

IMA 2005-029

CNMNC symbol

Symbol

Gje-Ca