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Kerimasite

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Kerimasit
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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

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

Volumne (ų)

1976.184

Kristall 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

 
Garnet supergroup
{X3}[Y2](Z3)φ12
 
 

 
 
Silicate garnets; Schorlomite group (Z charge 10)
 
 
 

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

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

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

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

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

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Actuality: 19. May 2022 - 13:36:03

Other languages

German

Kerimasit

Spanish

Kerimasita

English

Kerimasite

Russian

Керимасит

CNMNC (IMA)-Number

IMA 2009-029

CNMNC symbol

Symbol

Kms

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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American-Mineralogist-Crystal-Structure-Database - search for: Kerimasite
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Russian pages

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German pages

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