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Kerimasit

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

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

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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

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 (Å³)	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)
	Calculated from d-spacing and intensity at 0.1541838 nm (Cu)
Morphology	Kristalle bis 100 µm, in Carbonatit

Crystals 3D

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Crystal Structure 3D

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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

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

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Pyrope	{Mg₃}[Al₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
'Garnet supergroup'	neue Definition: {X₃}[Y₂](Z₃)φ₁₂ kubisch : kubisch-hexakisoktaedrisch	9.AD.25
Katoite	{Ca₃}[Al₂](☐₃)(OH)₁₂ kubisch : m3m : Ia3d	9.AD.25
Majorite	Mg₃(MgSi)(SiO₄)₃ kubisch	9.AD.25
'Melanite' (Var.v. Andradite)		9.AD.25
Rubinite	Ca₃Ti³⁺₂Si₃O₁₂ kubisch : m3m : Ia3d	9.AD.25
Wadalite	Ca₆Al₅Si₂O₁₆Cl₃ kubisch : 43m : I43d	9.AD.25
Almandine	{Fe²⁺₃}[Al₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Andradite	{Ca₃}[Fe³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Calderite	{Mn²⁺₃}[Fe³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
'Hessonite' (Var.v. Grossular)	Ca₃Al₂(SiO₄)₃	9.AD.25
'Hibschite' (Var.v. Grossular)	Ca₃Al₂(SiO₄)_3-x(OH)_4*x {x<0.2-1.5} kubisch : m3m : Ia3d	9.AD.25
Kimzeyite	{Ca₃}[Zr₂](SiAl₂)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Uvarovite	{Ca₃}[Cr³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Goldmanite	{Ca₃}[V³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Grossular	{Ca₃}[Al₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Holtstamite	{Ca₃}[Al₂](Si₂)(☐)O₈(OH)₄ tetragonal : 4/mmm : I4₁/acd	9.AD.25
Hutcheonite	{Ca₃}[Ti₂](SiAl₂)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Knorringite	{Mg₃}[Cr³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Morimotoite	{Ca₃}[TiFe²⁺](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Schorlomite	{Ca₃}[Ti₂](SiFe³⁺₂)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Spessartine	{Mn²⁺₃}[Al₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Momoiite	{Mn²⁺₃}[V³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Kerimasite	{Ca₃}[Zr₂](SiFe³⁺₂)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Toturite	{Ca₃}[Sn⁴⁺₂](SiFe³⁺₂)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Menzerite-(Y)	{Y₂Ca}[Mg₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Elbrusite	{Ca₃}[U⁶⁺_0.5Zr_1.5](Fe³⁺₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Bitikleite	{Ca₃}[Sb⁵⁺Sn⁴⁺](Al₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Usturite	{Ca₃}[Sb⁵⁺Zr](Fe³⁺₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Eringaite	{Ca₃}[V³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Dzhuluite	{Ca₃}[Sb⁵⁺Sn⁴⁺](Fe³⁺₃)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Irinarassite	{Ca₃}[Sn⁴⁺₂](SiAl₂)O₁₂ kubisch : m3m : Ia3d	9.AD.25
Eltyubyuite	Ca₁₂Fe³⁺₁₀Si₄O₃₂Cl₆ kubisch : 43m : I43d	9.AD.25
Adrianite	Ca₁₂(Al₄Mg₃Si₇)O₃₂Cl₆ kubisch : 43m : I43d	9.AD.25
Priscillagrewite-(Y)	YCa₂Zr₂Al₃O₁₂ kubisch : m3m : Ia3d	9.AD.25
'Hydroandradite' (Var.v. Andradite)	Ca₃Fe³⁺₂(SiO4)_3-x(OH)_4x	9.AD.25
'Hydrougrandite'	(Ca,Mg,Fe²⁺)₃(Fe³⁺,Al)₂(SiO₄)_3-x(OH)_4x	9.AD.25
Nikmelnikovite	Ca₁₂Fe²⁺Fe³⁺₃Al₃(SiO₄)₆(OH)₂₀ trigonal : 3 : R3	9.AD.25
Henritermierite	{Ca₃}[Mn³⁺₂](Si₂)(☐)O₈(OH)₄ tetragonal : 4/mmm : I4₁/acd	9.AD.25

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Pyrope	{Mg₃}[Al₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-010
Almandine	{Fe²⁺₃}[Al₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-020
Spessartine	{Mn²⁺₃}[Al₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-030
Calderite	{Mn²⁺₃}[Fe³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-040
Knorringite	{Mg₃}[Cr³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-050
Majorite	Mg₃(MgSi)(SiO₄)₃ kubisch	VIII/A.08-060
Menzerite-(Y)	{Y₂Ca}[Mg₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-065
Grossular	{Ca₃}[Al₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-070
'Hibschite' (Var.v. Grossular)	Ca₃Al₂(SiO₄)_3-x(OH)_4*x {x<0.2-1.5} kubisch : m3m : Ia3d	VIII/A.08-080
Katoite	{Ca₃}[Al₂](☐₃)(OH)₁₂ kubisch : m3m : Ia3d	VIII/A.08-090
'Hydrougrandite'	(Ca,Mg,Fe²⁺)₃(Fe³⁺,Al)₂(SiO₄)_3-x(OH)_4x	VIII/A.08-100
Andradite	{Ca₃}[Fe³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-110
Schorlomite	{Ca₃}[Ti₂](SiFe³⁺₂)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-120
Morimotoite	{Ca₃}[TiFe²⁺](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-125
Uvarovite	{Ca₃}[Cr³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-130
Momoiite	{Mn²⁺₃}[V³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-138
Goldmanite	{Ca₃}[V³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-140
Eringaite	{Ca₃}[V³⁺₂](Si₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-145
Kimzeyite	{Ca₃}[Zr₂](SiAl₂)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-150
Bitikleite	{Ca₃}[Sb⁵⁺Sn⁴⁺](Al₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-160
Dzhuluite	{Ca₃}[Sb⁵⁺Sn⁴⁺](Fe³⁺₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-165
Usturite	{Ca₃}[Sb⁵⁺Zr](Fe³⁺₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-170
Irinarassite	{Ca₃}[Sn⁴⁺₂](SiAl₂)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-175
Toturite	{Ca₃}[Sn⁴⁺₂](SiFe³⁺₂)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-180
Kerimasite	{Ca₃}[Zr₂](SiFe³⁺₂)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-185
Elbrusite	{Ca₃}[U⁶⁺_0.5Zr_1.5](Fe³⁺₃)O₁₂ kubisch : m3m : Ia3d	VIII/A.08-190
Wadalite	Ca₆Al₅Si₂O₁₆Cl₃ kubisch : 43m : I43d	VIII/A.08-200
Eltyubyuite	Ca₁₂Fe³⁺₁₀Si₄O₃₂Cl₆ kubisch : 43m : I43d	VIII/A.08-205
Holtstamite	{Ca₃}[Al₂](Si₂)(☐)O₈(OH)₄ tetragonal : 4/mmm : I4₁/acd	VIII/A.08-210
Henritermierite	{Ca₃}[Mn³⁺₂](Si₂)(☐)O₈(OH)₄ tetragonal : 4/mmm : I4₁/acd	VIII/A.08-220

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Schorlomite	{Ca₃}[Ti₂](SiFe³⁺₂)O₁₂ kubisch : m3m : Ia3d	9.AC.500
Morimotoite	{Ca₃}[TiFe²⁺](Si₃)O₁₂ kubisch : m3m : Ia3d	9.AC.510
Kimzeyite	{Ca₃}[Zr₂](SiAl₂)O₁₂ kubisch : m3m : Ia3d	9.AC.530
Kerimasite	{Ca₃}[Zr₂](SiFe³⁺₂)O₁₂ kubisch : m3m : Ia3d	9.AC.540
Toturite	{Ca₃}[Sn⁴⁺₂](SiFe³⁺₂)O₁₂ kubisch : m3m : Ia3d	9.AC.560
Irinarassite	{Ca₃}[Sn⁴⁺₂](SiAl₂)O₁₂ kubisch : m3m : Ia3d	9.AC.570

CNMNC (IMA)-Number

IMA 2009-029

CNMNC symbol

Symbol

Kms

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

German pages	DeWikiPedia - search for: Kerimasit Google-Bilder-Suche - search for: Kerimasit Mineralogisch-Petrographisches-Institut Hamburg - search for: Kerimasit
English pages	Mindat - search for: Kerimasite Webmineral - search for:Kerimasite Handbook-of-Mineralogy - search for: Kerimasite RRUFF - Raman, XRD and other mineral data - search for: Kerimasite RRUFF - References and PDF downloads - search for: Kerimasite American-Mineralogist-Crystal-Structure-Database - search for: Kerimasite Athena - search for: Kerimasite
Russian pages	Webmineral.ru - search for: Керимасит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Kerimasit
Crystal-Treasure.com - search for: Kerimasit
Bosse - search for: Kerimasit

Locations with GPS information