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Chromium

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Sichuan Province, China
© Thomas Witzke




Formula:
Cr
System:IsometricColour:White
Lustre:MetallicHardness:9
Name:From the Greek chroma, color, since all chromium compounds are colored.
This page provides mineralogical data about Chromium.

Classification of Chromium

IMA status:Approved
Strunz 8th edition ID:1/A.06-10
Nickel-Strunz 10th (pending) edition ID: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
Dana 7th edition ID:1.1.15.1
Dana 8th edition ID:1.1.12.1

1 : NATIVE ELEMENTS AND ALLOYS
1 : Metals, other than the Platinum Group
Hey's CIM Ref.:1.55

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

Type Locality:Anduo Cr deposit, Amdo Co. (Anduo Co.), Nagchu Prefecture (Naqu Prefecture), Tibet Autonomous Region, China
Geological Setting of type material:Heavy sands derived from contact metamorphic zone between siliceous marble and ultramafic rock.

Physical Properties of Chromium

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:White
Hardness (Mohs):9
Hardness (Vickers):VHN100=1875 - 2000
Tenacity:Brittle
Comment:On synthetic material
Density (measured):7.17 g/cm3
Density (calculated):7.20 g/cm3

Crystallography of Chromium

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Im3m {I4/m 3 2/m}
Space Group Setting:Im3m
Cell Parameters:a = 2.8839Å
Unit Cell Volume:V 23.99 ų (Calculated from Unit Cell)
Z:2
Morphology:Grains to 20 microns.
Comment:Synthetic

Optical Data of Chromium

Type:Isotropic
Colour in reflected light:White with yellow tint

Chemical Properties of Chromium

Formula:
Cr
Essential elements:Cr
All elements listed in formula:Cr

Relationship of Chromium to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
1.AE.05Molybdenum
Mo
1.AE.05Iron
Fe
1.AE.05Kamacite
(Fe,Ni)
1.AE.05Tungsten
W
1.AE.05UM2001-06-E:CrFeNi
Fe
 
7
Cr
 
2
Ni
1.AE.10Taenite
(Fe,Ni)
1.AE.10Tetrataenite
FeNi
1.AE.10Antitaenite
Fe
 
3
Ni
1.AE.15Chromferide
Fe
 
3
Cr
 
1-x
(x=0.6)
1.AE.15Ferchromide
Cr
 
1.5
Fe
 
0.5-x
1.AE.15Wairauite
CoFe
1.AE.20Awaruite
Ni
 
3
Fe
1.AE.25Jedwabite
Fe
 
7
(Ta,Nb)
 
3
1.AE.30Manganese
Mn
Related Minerals - Hey's Index Grouping:

- +
1.1Copper
Cu
1.2Silver
Ag
1.5Gold
Au
1.6Auricupride
Cu
 
3
Au
1.7Tetra-auricupride
AuCu
1.8Zinc
Zn
1.9Cadmium
Cd
1.10Danbaite
CuZn
 
2
1.11Zhanghengite
CuZn
1.12Mercury
Hg
1.13Kolymite
Cu
 
7
Hg
 
6
1.14Moschellandsbergite
Ag
 
2
Hg
 
3
1.15Eugenite
Ag
 
11
Hg
 
2
1.16Schachnerite
Ag
 
1.1
Hg
 
0.9
1.17Paraschachnerite
Ag
 
3
Hg
 
2
1.18Luanheite
Ag
 
3
Hg
1.19Weishanite
(Au,Ag)
 
3
Hg
 
2
1.20Indium
In
1.21Aluminium
Al
1.22Khatyrkite
(Cu,Zn)Al
 
2
1.23Cupalite
(Cu,Zn)Al
1.24Diamond
C
1.25Graphite
C
1.26Chaoite
C
1.27Lonsdaleite
C
1.28Silicon
Si
1.29Tin
Sn
1.30Lead
Pb
1.31Anyuiite
Au(Pb,Sb)
 
2
1.31Novodneprite
AuPb
 
3
1.32Leadamalgam
Pb
 
0.7
Hg
 
0.3
1.33Arsenic
As
1.34Arsenolamprite
As
1.35Paxite
CuAs
 
2
1.36Koutekite
Cu
 
5
As
 
2
1.37Domeykite
Cu
 
3
As
1.38Algodonite
(Cu
 
1-x
As
 
x
)
1.39Novakite
Cu
 
20
AgAs
 
10
1.40Kutinaite
Ag
 
6
Cu
 
14
As
 
7
1.41Antimony
Sb
1.42Stibarsen
AsSb
1.43Paradocrasite
Sb
 
3
As
1.44Horsfordite
Cu, Sb
1.45Cuprostibite
Cu
 
2
(Sb,Tl)
1.46Allargentum
(Ag
 
1-x
Sb
 
x
)
1.47Aurostibite
AuSb
 
2
1.48Dyscrasite
Ag
 
3
Sb
1.49Bismuth
Bi
1.50Maldonite
Au
 
2
Bi
1.51Sulphur
S
 
8
1.52Rosickýite
S
1.53Selenium
Se
1.54Tellurium
Te
1.56Rhenium
Re
1.57Iron
Fe
1.58Chromferide
Fe
 
3
Cr
 
1-x
(x=0.6)
1.59Ferchromide
Cr
 
1.5
Fe
 
0.5-x
1.60Wairauite
CoFe
1.61Nickel
Ni
1.62Kamacite
(Fe,Ni)
1.63Taenite
(Fe,Ni)
1.64Tetrataenite
FeNi
1.65Awaruite
Ni
 
3
Fe
1.66Palladium
(Pd,Pt)
1.67Potarite
PdHg
1.68Paolovite
Pd
 
2
Sn
1.69Stannopalladinite
(Pd,Cu)
 
3
Sn
 
2
1.70Cabriite
Pd
 
2
CuSn
1.71Taimyrite-I
(Pd,Cu,Pt)
 
3
Sn
1.72Atokite
(Pd,Pt)
 
3
Sn
1.73Rustenburgite
(Pt,Pd)
 
3
Sn
1.74Zvyagintsevite
(Pd,Pt,Au)
 
3
(Pb,Sn)
1.75Plumbopalladinite
Pd
 
3
Pb
 
2
1.76Osmium
(Os,Ir,Ru)
1.77Iridium
(Ir,Os,Ru)
1.82Platinum
Pt
1.83Hongshiite
PtCu
1.84Niggliite
PtSn
1.85Isoferroplatinum
Pt
 
3
Fe
1.86Tetraferroplatinum
PtFe
1.87Tulameenite
Pt
 
2
CuFe
1.88Ferronickelplatinum
Pt
 
2
FeNi
1.89Rhodium
(Rh,Pt)

Other Names for Chromium

Synonyms:
IMA1980-094
Other Languages:
Afrikaans:Chroom
Albanian:Kromi
Arabic:كروم
Armenian:Քրոմ
Asturian:Cromu
Azeri:Xrom
Basque:Kromo
Belarusian:Хром
Bengali:ক্রোমিয়াম
Bosnian (Latin Script):Hrom
Bulgarian:Хром
Catalan:Crom
Corsican:Cromu
Croatian:Krom
Czech:Chróm
Danish:Krom
Dutch:Chroom
Esperanto:Kromo
Estonian:Kroom
Finnish:Kromi
French:Chrome
Friulian:Crom
Galician:Cromo
German:Chrom
Greek:Χρώμιο
Haitian:Kwòm
Hebrew:כרום
Hindi:क्रोमियम
Hungarian:Króm
Icelandic:Króm
Ido:Kromio
Indonesian:Kromium
Italian:Cromo
Japanese:クロム
自然クロム
Kannada:ಕ್ರೋಮಿಯಮ್
Korean:크로뮴
Kurdish (Latin Script):Krom
Latin:Chromium
Latvian:Hroms
Lithuanian:Chromas
Lojban:rogjinme
Low Saxon:Chrom
Luxembourgish:Chrom
Macedonian:Хром
Malay:Kromium
Malayalam:ക്രോമിയം
Manx:Cromium
Maori:Konukita
Nahuatl:Tlapāltepoztli
Norwegian (Bokmål):Krom
Norwegian (Nynorsk):Krom
Occitan:Cròme
Persian:کروم
Polish:Chrom
Portuguese:Crômio
Quechua:Krumu
Romanian:Crom
Russian:Хром
Saterland Frisian:Chrom
Serbian (Cyrillic Script):Хром
Serbo-Croatian:Hrom
Sicilian:Cromu
Simplified Chinese:自然铬
Slovak:Chróm
Slovenian:Krom
Spanish:Cromo
Swahili:Chromi
Swedish:Krom
Tamil:குரோமியம்
Thai:โครเมียม
Turkish:Krom
Ukrainian:Хром
Uzbek (Latin Script):Xrom
Vietnamese:Crom

Other Information

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

References for Chromium

Reference List:

- +
Mingyu Zhu and Yunxiang Liu (1981): Discovery of native chromium in Xizang (Tibet). Chinese Science Bulletin 26(11), 1014-1017.

Yue Suqin, Wang Wenying, and Sun Suqiong (1981): A new mineral--Native chromium. Chinese Science Bulletin [Kexue Tongbao] 26(15), 959-60. - American Mineralogist (1982), 67, 854-55 (abstract).

Internet Links for Chromium

Search Engines:
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  • External Links:
  • Look for Chromium on Webmineral
  • Look for Chromium on Athena Mineralogy
  • Look for Chromium on Wikipedia
  • Look for Chromium on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Chromium details from Handbook of Mineralogy (PDF)
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  • Fabre Minerals - search for Chromium specimens
  • Fine Minerals from Weinrich Minerals, Inc.
  • Search for Chromium on Well-Arranged Molecules
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  • Rare and Unusual minerals at Mineralogical Research Company
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  • Specimens:The following Chromium specimens are currently listed for sale on minfind.com.
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  • Localities for Chromium

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • Northern Territory
      • Central Desert Shire
        • Illogwa Creek
    Illogwa 1996
    China
     
    • Henan Province
      • Nanyang Prefecture
        • Tongbai Co.
    Peixue Tian, Qingsong Fang, Keqiao Chen, and Zhizhong Peng (1983): Acta Mineralogica Sinica 3(4), 241-245
        • Xichuan Co.
    Zexian Xu, Runji Zhang, Zhenyun Liu, and Xingtu Sheng (1987): Acta Petrologica et Mineralogica 6(4), 351-357
    • Jiangsu Province
      • Lianyungang Prefecture
        • Donghai Co.
          • Maobei
    Jingsui Yang, Zhiqin Xu, Wenji Bai, Qingsong Fang, and Zhongming Zhang (2006): 3rd Annual Meeting of the Asia Oceania Geosciences Society (AOGS), July 10-14, 2006, Abstract 59-SE-A0643.
    • Shandong Province
      • Linyi Prefecture
        • Yimeng Mtns (Yimeng Shan)
          • Mengyin Co.
            • Mengyin Kimberlite field
              • Changma Kimberlite belt
                • Wangcun deposit
    Gorshkov, A.I., Titkov, S.V., Yan Nan Bao, Ryabchikov, I.D., and Magazina, L.O. (2006): Geology of Ore Deposits 48(4), 326-334.
    • Sichuan Province
      • Garzê Autonomous Prefecture (Ganzi Autonomous Prefecture)
        • Danba Co.
          • Yangliuping Cu-Ni-PGE ore field
    Yue Suqin, Wang Wenying, and Sun Suqiong (1981): Chinese Science Bulletin 26(15), 959-960
    • Tibet Autonomous Region
      • Nagchu Prefecture (Naqu Prefecture)
        • Amdo Co. (Anduo Co.)
    Mingyu Zhu and Yunxiang Liu (1981): Chinese Science Bulletin 26(11), 1014-1017
      • Shannan Prefecture (Lhokha Prefecture; Lhoka Prefecture)
        • Qusum Co. (Qusong Co.)
    Wenji Bai, Jingsui Yang, Qingsong Fang, Binggan Yan, and Zhongming Zhang (2001): Earth Science Frontiers 8(3), 111-121
    • Yunnan Province
      • Dali Autonomous Prefecture
        • Midu Co.
    Shengwei Wang, Xiaoming Sun, Zhenwen Liao, Bangguo Zhou, Maojin Luo, Yang Guo, Xiaofang Jiang, Huaping Zhu, Dong Ma, and Zhanwu Shen (2012): Mineral Deposits 31(6), 1259-1276
    Japan
     
    • Kyushu Region
      • Nansei Archipelago
        • Okinawa Prefecture
          • Senkaku Islands (Diaoyudao Islands; Diaoyutai Islands)
    Bideaux, et al: Handbook of Mineralogy.; Ouroboros - www.um.u-tokyo.ac.jp/museum/ouroboros/01_03/diaoyudaoite.html
    Kosovo
     
    • District of Pristina (District of Prishtina)
      • Glavika
    Buletini i Shkencave Gjeologjike 2012
    Russia
     
    • Eastern-Siberian Region
      • Prebaikalia (Pribaikal'e)
        • Irkutskaya Oblast'
          • Bodaibo
            • Lena Gold District
              • Kropotkinsky ore cluster
    Keren Tan (1998): Gold Science and Technology 6(4), 29-37
      • Sakha Republic (Saha Republic; Yakutia)
        • Daldyn-Alakit kimberlite field
          • Daldyn
    [AmMin 84:993]
    • Urals Region
      • Southern Urals
        • Orenburgskaya Oblast'
          • Kumak ore field
    Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    The Moon
     
    • Mare Crisium
    P.M. Kartashov data
    Mineral and/or Locality  
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