Chaoite Mineral Data

General Chaoite Information

Chemical Formula:

Composition:

Molecular Weight = 12.01 gm

Carbon 100.00 % C

______

100.00 %

Empirical Formula:

Environment:

Occurs in shock-metamorphosed graphite gneisses, and in ureilite meteorites. Thin lamellae, alternating with graphite.

IMA Status:

Approved IMA 1969

Locality:

Ries Crater, Bavaria, Germany. Goalpur and Dyalpur meteorites. Link to MinDat.org Location Data.

Name Origin:

Named for Edward C. T. Chao (1919-), Chinese-U.S. Petrologist.

Chaoite Image

Images:

Chaoite

Comments: Dark masses of chaoite intermixed with graphite on rock shocked by meteorite impact.
Location: Ries Crater, Bopfingen, Bavaria, Baden-Wurttemberg. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chaoite Crystallography

Axial Ratios:

a:c = 1:1.57331

Cell Dimensions:

a = 8.948, c = 14.078, Z = 168; V = 976.17 Den(Calc)= 3.43

Crystal System:

Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.26(1), 4.47(1), 4.12(0.8),

Physical Properties of Chaoite

Color:

Dark gray.

Density:

3.33 - 3.43, Average = 3.38

Diaphaneity:

Subopaque

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Sub Metallic

Calculated Properties of Chaoite

Electron Density:

Bulk Density (Electron Density)=3.43 gm/cc
note: Specific Gravity of Chaoite =3.43 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Chaoite= 0.16 barns/electron
U=PE_Chaoite x rElectron Density= 0.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chaoite is Not Radioactive

Chaoite Classification

Dana Class:

01.03.06.04 (01)Native Elements

(01.03)with semi-metallic and non-metallic elements

(01.03.06)Carbon Polymorph group

01.03.06.01 Diamond C F d3m 4/m 3 2/m

01.03.06.02 Graphite C P 6₃/mmc 6/m 2/m 2/m

01.03.06.03 Lonsdaleite C P 6₃/mmc 6/m 2/m 2/m

01.03.06.04 Chaoite C P 6/mmm 6/m 2/m 2/m

01.03.06.05 Fullerite! C60 pseudo-CUBIC 4/m 2/m 2/m

Strunz Class:

01.CB.05b 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides)

01.C - Metalloids and Nonmetals

01.CB -Carbon-silicon family

01.CB.05b Chaoite C P 6/mmm 6/m 2/m 2/m

Other Chaoite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Chaoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Chaoite

C
Dana No: 01.03.06.04 Strunz No: 01.CB.05b
Locality:

Notes:

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