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

Kerimasite

Pictures (2 Images total)

Kerimasit
Views (File:
1574873070
): 392
Kerimasit
isometrischer Kerimasit, Magnet Cove, Arkansas, USA; BB < 1 mm, analysiert
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: USA/Arkansas/Hot Spring Co./Magnet Cove
Mineral: Kerimasite
Image: 1574873070
License: Usage for Mineralienatlas project only
Kerimasit

isometrischer Kerimasit, Magnet Cove, Arkansas, USA; BB < 1 mm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2019-11-27
Locality: Magnet Cove / Hot Spring Co. / Arkansas / USA
Kerimasit
Views (File:
1720271563
): 58
Kerimasit
Emmelberg, Üdersdorf, Eifel; Bb 2,5 mm; Ex-Spezimen Carsten Slotta, analysiert.
Copyright: Guy Heinen; Contribution: guyhein
Collection: Guy Heinen
Location: Deutschland/Rheinland-Pfalz/Vulkaneifel, Landkreis/Daun/Üdersdorf/Emmelberg
Mineral: Kerimasite
Image: 1720271563
License: Usage for Mineralienatlas project only
Kerimasit

Emmelberg, Üdersdorf, Eifel; Bb 2,5 mm; Ex-Spezimen Carsten Slotta, analysiert.

Collection: Guy Heinen
Copyright: Guy Heinen
Contribution: guyhein 2024-07-06
Locality: Emmelberg / Üdersdorf / Daun / Vulkaneifel, Landkreis / Rheinland-Pfalz / Deutschland

Collectors Summary

Color hell- bis dunkelbraun
Lustre Glasglanz
Cleavages keine
Crystal System kubisch, Ia3d
Morphology Kristalle bis 100 µm, in Carbonatit

Chemism

Chemical formula

{Ca3}[Zr2](SiFe3+2)O12

Additional chem. information

Granat Gruppe

Chemical composition

Calcium, Eisen, Silicium, Zirconium, Sauerstoff

Unit weight: 634.45269 u; Number of atoms in the formula: 20

Info

Empirical formula:

{Ca3}[Zr2](SiFe2)O12

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

30.26

12

60.00

15.9994300

191.9931600

Silicon

Si

4.43

1

5.00

28.0855300

28.0855300

Calcium

Ca

18.95

3

15.00

40.0784000

120.2352000

Iron

Fe

17.60

2

10.00

55.8452000

111.6904000

Zirconium

Zr

28.76

2

10.00

91.2242000

182.4484000

Analysis wt%

SiO2 : 8.37, Nb2O5 : 3.00, ZrO2 : 34.42, TiO2 : 2.10, Al2O3 : 6.83, Fe2O3 : 16.01, CaO : 27.31, Ln2O3 : 0.94 (Ref: Mineralogical Magazine 2010)

Strunz 9th edition incl. updates

9.AD.25

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
D: Insel(Neso)silikate ohne weitere Anionen; Kationen in oktahedraler [6] und gewöhnlich größerer Koordination
25:Granat-Gruppe

Lapis Classification

VIII/A.08-185

VIII: SILIKATE
A: Inselsilikate mit [SiO4] 4--Baugruppen
8: Kationen in kubischer und oktaedrischer Koordination [8+6]; Granat-Gruppe

Classification by Hölzel

9.AC.540

9: SILICATES
A: Nesosilicates
C: Garnet-Group
5: Schorlomite-Group - 6-coord. Ti, Zr, Sn

IMA status

anerkannt, IMA WEB-Seite, Neue Mineralien Juli 2009

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Garnet supergroup  ⇒ Silicate garnets; Schorlomite group (Z charge 10)

Optical Properties

Color

hell- bis dunkelbraun

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

RI value α / ω / n

1.945

Ri mean

1.945

2V angle

Isotropisch

Pleochroism

isotrop

Crystallography

Crystal System

kubisch

Class (H-M)

m3m

Space Group number

230

Space Group

Ia3d

Cell parameters a (Å)

12.549

Cell parameters b (Å)

-

Cell parameters c (Å)

-

Cell parameters a/b or c/a

1

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

8

Volume (ų)

1976.184

Crystal structure

Granatstruktur, siehe A.N. Zaitsev et al., 2010

X-Ray Powder Diffraction

4.441(41), 3.140(91), 2.808(70), 2.564(93), 1.985(21), 1.741(26), 1.677(100), 1.403(17)

XRD chart Kerimasite

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

Morphology

Kristalle bis 100 µm, in Carbonatit

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

VHN (Hardness Vickers)

1228 (25g)

Density (g/cm³)

4.105(1) ber.

4.265 ( ρ calc. Mineralienatlas )

Cleavages

keine

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Tansania/Arusha, Region/Ngorogoro/Kerimasi, Vulkan

Preface

Name from

der Typlokalität

Author (Name, Year)

Anatoly N. Zaitsev et al., 2010

References

A. N. Zaitsev, C. T. Williams, S. N. Britvin, I. V. Kuznetsova, J. Spratt, S. V. Petrov and J. Keller: Kerimasite, Ca3Zr2(FormulaSi)O12, a new garnet from carbonatites of Kerimasi volcano and surrounding explosion craters, northern Tanzania. Mineralogical Magazine; October 2010; v. 74; no. 5; p. 803-820.

IMA WEB-Seite, Neue Mineralien Juli 2009.

Grew, E.S., Locock, A.J., Mills, S.J., Galuskina, I.O., Galuskin, E.V., Halenius, U., 2012; Nomenclature of the garnet supergroup. American Mineralogist; preprint December 2012 - [Formel]

Uher, P., Milovská, S., Milovský, R., Koděra, P., Bačík, P., Bilohuščin, V. - Kerimasite, {Ca3}[Zr2]( )O12 garnet from the Vysoká-Zlatno skarn, Štiavnica stratovolcano, Slovakia. Mineralogical Magazine, 79 (2015), 715-733

IMA group assignments

 
{X3}[Y2](Z3)φ12
 
 


 
 
 
{Ca3}[Sn4+2](SiAl2)O12
kubisch
Ia3d

 
 
 
{Ca3}[Zr2](SiFe3+2)O12
kubisch
Ia3d

 
 
 
{Ca3}[Zr2](SiAl2)O12
kubisch
Ia3d

 
 
 
{Ca3}[Ti2](SiFe3+2)O12
kubisch
Ia3d

 
 
 
{Ca3}[Sn4+2](SiFe3+2)O12
kubisch
Ia3d

Refresh list

Actuality: 06. Feb 2025 - 12:32:41

Other languages

German

Kerimasit

Spanish

Kerimasita

English

Kerimasite

Russian

Керимасит

CNMNC (IMA)-Number

IMA 2009-029

CNMNC symbol

Symbol

Kms

Locations with GPS information

IDs

GUSID (Global unique identifier short form) wukMp7y8uk60X7aerNg5Lw
GUID (Global unique identifier) A70CE9C2-BCBC-4EBA-B45F-B69EACD8392F
Database ID 5236