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UM1990-09-C:Si

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Discuss UM1990-09-C:Si

Edit UM1990-09-C:Si Add Synonym Edit CIF structures Clear Cache

Formula:

β-SiC

Dimorph of:

Moissanite

Fuxian material: (1) vesicular, milky masses, 0.3 mm to 1.5 mm across, enclosing moissanite, quartz, and euhedral crystals of the beta SiC; (2) epitaxial overgrowths on moissanite: [1l0] of the beta phase is parallel to [10-10] of moissanite. Also a well ordered 3C SiC polytype of the beta phase is also present.

Likely formed during a rapid ascent and vesiculation of CO₂-rich kimberlitic magma (PT conditions allowing for stability of high quartz is
also stable: P > 10 kB and < 20-28 kB, T ca. 1000 ^oC), under more oxidizing conditions than those at which earlier moissanite and diamond have arisen.

Yakutian material: rare, rounded grains, ca. 0.1 mm in size, intergrown or enclosed in moissanite. Also encloses silicon and a phase corresponding to linzhiite.

This dimorph is uncommon in terrestrial deposits, but is common in presolar silica carbides.

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Unique IdentifiersHide

Mindat ID:

51796

Long-form identifier:

mindat:1:1:51796:8

Similar NamesHide

UM1982-06-C:Si		~Si₃C₄
UM1989-08-E:CaSi		SiCa
UM1995-14-N:Si		β-Si₃N₄
UM1999-11:I:CuS		Cu(I,S)

Chemistry of UM1990-09-C:SiHide

Mindat Formula:

β-SiC

Element Weights:

Element	% weight
Si	70.045 %
C	29.955 %

Calculated from ideal end-member formula.

Elements listed:

C, Si - search for minerals with similar chemistry

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
2.513 Å	(100)
2.181 Å	(10)
1.542 Å	(30)
1.313 Å	(30)
1.262 Å	(10)
1.091 Å	(10)
0.999 Å	(20)
0.992 Å	(20)
0.987 Å	(10)

Comments:

Yakutian material

Other InformationHide

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for UM1990-09-C:SiHide

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References for UM1990-09-C:SiHide

Reference List:

(1) Leung, I., Guo, W., Friedman, I., Gleason, J. (1990) Natural occurrence of silicon carbide in a diamondiferous kimberlite from Fuxian. Nature: 346: 352-354; (2) Marshintsev, V.K. (1990) Natural silicon carbide in kimberlitic rocks of Yakutiya. Mineral. Zhurnal: l2(3): 17-26 (in Russian); in: Jambor, J.L., Grew, E.S. (1992): New mineral Names. American Mineralogist: 77: 208

Smith, D. G.W.; Nickel, E. H. (2007) A System of Codification for Unnamed Minerals: Report of the Subcommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. The Canadian Mineralogist, 45 (4). 983-990 doi:10.2113/gscanmin.45.4.983

Localities for UM1990-09-C:SiHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


China
Liaoning Dalian Wafangdian City ⓘ Fuxian kimberlite field	Leung et al. (1990) +1 other reference

Russia
Kamchatka Krai Yelizovsky District ⓘ Avachinsky volcano (Avacha volcano; Avachinskaya Sopka)	Kaminsky et al. (2016)
ⓘ Sakha	Marshintsev (1990) +1 other reference

USA
ⓘ Green River Formation	Bulletin 69 +1 other reference

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