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Chromferide

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SKY725318

Chromferide

Type Locality

Description Tabs

Description
Locality: 
Efim Area, Kumak, Orenburg Oblast, Russian Federation
Class: 
Single Crystal
Size Range: 
Micromount (under 1cm)
Size: 
0.015 × 0.012 × 0.012 cm
Description

Very small single crystal of the extremely rare mineral chromferide, a natural alloy of chromium and iron of formula Fe3Cr (1-x).

It belongs to the Nickel-Strunz class of I.Native Elements.

Analyzed specimen, see copy of the analysis and all explanations referring to its origin in the attachment.

Chromferide has only been known from three localities worldwide, being this one from the type locality in Russia.

Micro-nugget 0.15x0.12x0.12 mm of pure, analyticaly confirmed by microprobe CHROMFERIDE, rare Fe-Cr intermetallide, extracted from heavy fraction of unspecified gold placer in area of Kumak gold deposit - the type locality of the species.

Peaks of O and Si in the spectrum were apparently excitated from quartz powder impregnated within surface of the particle and don’t belongs to its composition. Note microporous structure of this unusual compound - it also able to contain quartz in its pores. The empirical formula of this grain is close to ideal composition of Chromferide Fe3Cr1-x - (Fe2.45Ni0.55)3.00Cr1.10. The formula is not exact correct because of an unpolished surface was analyzed.

The reason of the coin as a support is that a conductive surface is needed in order to analyze the specimen by SEM/EDX. However this coin can be very easily removed if desired by the buyer.

Together with the specimen you will receive its certificate with the Chromferide analysis, SEM photo with marked point of analysis, EDX spectrum and description.

Mineral Data
What's on the rock

Chromferide

Formula: 
Fe3Cr1-x (x=0.6)
Strunz: 
1.AE.15
Hardness: 
4.0
Type Locality: 
Efim area, Kumak ore field, Orenburgskaya Oblast', Southern Urals, Urals Region, Russia...

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Start 01 Jun 18:00
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Shipping Information

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Spain
5.50
Europe
8.50
Rest of the World
9.50

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