Chromium (original) (raw)

A valid IMA mineral species

About ChromiumHide

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Name:

From the Greek chroma, color, since all chromium compounds are colored.

This page provides mineralogical data about Chromium.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1037:1

804fd70b-f682-40f6-ab00-536c32fa5b2c

IMA Classification of ChromiumHide

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Classification of ChromiumHide

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1.AE.05

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
A : Metals and Intermetallic Alloys
E : Iron-chromium family

1.1.12.1

1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group

1.55

1 : Elements and Alloys (including the arsenides, antimonides and bismuthides of Cu, Ag and Au)

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of ChromiumHide

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Hardness:

VHN100=1875 - 2000 - Vickers

Comment:

On synthetic material

Density:

7.17 g/cm3 (Measured) 7.20 g/cm3 (Calculated)

Optical Data of ChromiumHide

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Reflectivity:

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 70.0%.

Colour in reflected light:

White with yellow tint

Chemistry of ChromiumHide

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Crystallography of ChromiumHide

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Class (H-M):

m_3_m _(_4/_m_32/m ) - Hexoctahedral

Cell Parameters:

a = 2.8839 Å

Unit Cell V:

23.99 ų (Calculated from Unit Cell)

Morphology:

Grains to 20 microns.

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of ChromiumHide

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General Appearance of Type Material:

Grains of about 20 µm in size. Rimmed by danbaite.

Place of Conservation of Type Material:

National Museum for Geology; Beijing, China, number M10485 (type).

Geological Setting of Type Material:

Heavy sands derived from contact metamorphic zone between siliceous marble and ultramafic rock.

Associated Minerals at Type Locality:

Synonyms of ChromiumHide

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Other Language Names for ChromiumHide

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Farsi/Persian:کروم

Kurdish (Latin Script):Krom

Low Saxon/Low German:Chrom

Norwegian (Nynorsk):Krom

Saterland Frisian:Chrom

Serbo-Croatian:Hrom

Simplified Chinese:自然铬

Uzbek (Latin Script):Xrom

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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 ChromiumHide

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References for ChromiumHide

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Localities for ChromiumHide

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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

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- 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.