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Chaoite

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Big Photo

Möttingen, Ries Crater, Nördlingen, Swabia, Bavaria, Germany
© JF Carpentier 2007




Formula:
C
System:HexagonalColour:Black
Hardness:1 - 2
Name:For Edward Ching-Te Chao (1919-2008), USGS petrologist.
Polymorph of:Diamond, Graphite, Lonsdaleite
This page provides mineralogical data about Chaoite.

Classification of Chaoite

IMA status:Approved 1968
Strunz 8th edition ID:1/B.02-20
Nickel-Strunz 10th (pending) edition ID:1.CB.05b

1 : ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)
C : Metalloids and Nonmetals
B : Carbon-silicon family
Dana 7th edition ID:1.3.5.4
Dana 8th edition ID:1.3.6.4

1 : NATIVE ELEMENTS AND ALLOYS
3 : Semi-metals and non-metals
Hey's CIM Ref.:1.26

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

Type Locality:Möttingen, Ries Crater, Nördlingen, Swabia, Bavaria, Germany
Geological Setting of type material:Shock metamorphosed graphite bearing gneiss

Occurrences of Chaoite

Geological Setting:Meteorites

Physical Properties of Chaoite

Diaphaneity (Transparency):Opaque
Colour:Black
Hardness (Mohs):1 - 2
Density (calculated):3.43 g/cm3

Crystallography of Chaoite

Crystal System:Hexagonal
Class (H-M):6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:P6/mmm {P6m 2/m 2/m}
Space Group Setting:P6/mmm
Cell Parameters:a = 8.948Å, c = 14.078Å
Ratio:a:c = 1 : 1.573
Unit Cell Volume:V 976.17 ų (Calculated from Unit Cell)
Z:168
Morphology:Thin lamellae alternating with graphite.

Chemical Properties of Chaoite

Formula:
C
Essential elements:C
All elements listed in formula:C
Common Impurities:Si,Cl

Relationship of Chaoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
1.CB.05aGraphite
C
1.CB.05cFullerite
C
 
60
1.CB.10aDiamond
C
1.CB.10bLonsdaleite
C
1.CB.15Silicon
Si
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
1.27Lonsdaleite
C
1.28Silicon
Si
1.29Tin
Sn
1.30Lead
Pb
1.31Anyuiite
Au(Pb,Sb)
 
2
1.31Novodneprite
AuPb
 
3
1.32Leadamalgam
HgPb
 
2
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
Cu
 
2
AgAs
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
1.55Chromium
Cr
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
SnCu
1.71Taimyrite
(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)
Related Minerals - Dana Grouping):

- +
1.3.5.1Diamond
C
1.3.5.2Graphite
C
1.3.5.3Lonsdaleite
C
1.3.5.5Fullerite
C
 
60

Other Names for Chaoite

Synonyms:
IMA1968-019
Other Languages:
German:Chaoit
Simplified Chinese:赵石墨
Spanish:Chaoita

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 Chaoite

Reference List:

- +
American Mineralogist: 54: 326.

Internet Links for Chaoite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Chaoite details from Handbook of Mineralogy (PDF)
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    • Localities for Chaoite

    Hide Locality List
    (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.
    Germany
     
    • Bavaria
      • Swabia
        • Nördlingen
          • Ries Crater
    		Science (1968) 161, 363–364; Amer. Mineral., 54, 326
    India
     
    • Assam
    		Handbook of Mineralogy
    • Uttar Pradesh
    		Handbook of Mineralogy
    Russia
     
    • Eastern-Siberian Region
      • Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai)
        • Anabarskii massif
          • Popigai river
    		Pavel M. Kartashov data
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