Chaoite Mineral Data

Chaoite Mineral Data

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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 DipyramidalH-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

Diaphaniety:

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:

r_electron=3.43 gm/cc
note: r_Chaoite=3.43 gm/cc.

Fermion Index

Fermion Index = 0.011
Boson Index = 0.989

Photoelectric:

PE_Chaoite= 0.16 barns/electron
U=PE_Chaoite x r_electron= 0.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chaoite is Not Radioactive

Chaoite Classification

Dana Class:

1.3.6.4 (1)Native Elements

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

(1.3.6)Carbon Polymorph group

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

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

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

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

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

Strunz Class:

I/B.02-20 I - Elements

I/B - Semimetals and nonmetals

I/B.02 - Carbon series, Graphite - Lonsdaleite

I/B.02-10 Graphite C P 6₃/mmc 6/m 2/m 2/m

I/B.02-20 Chaoite C P 6/mmm 6/m 2/m 2/m

I/B.02-30 Moissanite SiC P 6₃mc 6mm

I/B.02-40 Diamond C F d3m 4/m 3 2/m

I/B.02-50 Lonsdaleite C P 6₃/mmc 6/m 2/m 2/m

Other Chaoite Information

References:

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

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Chaoite

C
Dana No: 1.3.6.4 Strunz No: I/B.02-20
Locality:

Notes: