Lonsdaleite Mineral Data + 
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- 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
- 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
General Lonsdaleite Information |
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 Chemical Formula: |
C | ||
| Composition: |
Molecular Weight = 12.01 gm | ||
| Carbon 100.00 % C | |||
| ______ | |||
| 100.00 % | |||
| Empirical Formula: |
C | ||
| Environment: |
Associated with diamond in the Canyon Diablo, Goalpara, and Allan Hills 77283 meteorites. Also in diamond-bearing placers. | ||
| IMA Status: |
Approved IMA 1967 | ||
| Locality: |
Tunguska impact site, Russia. Other world-wide impact sites. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for Kathleen Lonsdale (1903-1971), English crystallographer. | ||
| Synonym: |
ICSD 27422 | ||
| PDF 19-268 | |||
Lonsdaleite Image | |||
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Images:
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Lonsdaleite Crystallography |
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| Axial Ratios: |
a:c = 1:1.63492 | ||
| Cell Dimensions: |
a = 2.52, c = 4.12, Z = 4; V = 22.66 Den(Calc)= 3.52 | ||
| Crystal System: |
Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.06(1), 2.19(1), 1.26(0.75), | ||
Physical Properties of Lonsdaleite |
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| Cleavage: |
[???] Perfect | ||
| Color: |
Brownish black, Light brownish yellow. | ||
| Density: |
3.3 - 3.52, Average = 3.41 | ||
| Diaphaniety: |
Translucent to Opaque | ||
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. | ||
| Hardness: |
7-8 | ||
| Luster: |
Adamantine | ||
| Streak: |
brownish yellow | ||
Optical Properties of Lonsdaleite |
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| Optical Data: |
Uniaxial (+/-), a=2.404, b=2.404, bire=0.0000. | ||
Calculated Properties of Lonsdaleite |
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| Electron Density: |
relectron=3.52 gm/cc |
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| Fermion Index |
Fermion Index = 0.011 Boson Index = 0.989 |
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| Photoelectric: |
PELonsdaleite = 0.16 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Lonsdaleite is Not Radioactive |
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Lonsdaleite Classification |
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| Dana Class: |
1.3.6.3 (1)Native Elements | ||
| (1.3)with semi-metallic and non-metallic elements | |||
| (1.3.6)Carbon Polymorph group | |||
| Strunz Class: |
I/B.02-50 I - Elements | ||
| I/B - Semimetals and nonmetals | |||
| I/B.02 - Carbon series, Graphite - Lonsdaleite | |||
Other Lonsdaleite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) | ||
| See Also: |
Links to other databases for Lonsdaleite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 - Mineral and Gemstone Kingdom 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris Search for Lonsdaleite using: Visit our Advertisers for Lonsdaleite : Translate Lonsdaleite Mineral Data : Ask about Lonsdaleite here : Print or Cut-and-Paste your Lonsdaleite Specimen Label here :
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