Chaoite Mineral Data

Chaoite Mineral Data

[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery]
John Betts - Fine Minerals
Classic minerals, out-of-print books & magazines, plus informative articles for collectors

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)

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info

Search for Chaoite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Chaoite :

AA Mineral Specimens

B & L Fine Minerals

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

The GeoZone

Wrights Rock Shop

Translate Chaoite Mineral Data :

Ask about Chaoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Chaoite Specimen Label here :

Chaoite

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

Notes: