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Lonsdaleite Mineral Data
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General Lonsdaleite Information
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Chemical Formula: |
C |
Composition: |
Molecular Weight = 12.01 gm |
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Carbon 100.00 % C |
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______ |
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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. |
Name Pronunciation: |
Lonsdaleite + Pronunciation |
Synonym: |
ICSD 27422 |
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PDF 19-268 |
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Lonsdaleite Image |
Images:
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Lonsdaleite
Comments: a) A Reflected light photograph of lonsdaleite and unidentified polymorph (New Phase) with lead comtamination. b) synchrotron X-ray diffraction, imaging and X-ray fluorescence fine-scale mapping of the different phases. (ESRF 2003 highlights).
Location: Shocked gneisses from the Popigai Crater, Russia.
Scale: See Image.
© Eur. Sync. Rad. Fac. |
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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 Dipyramidal H-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), |
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Physical Properties of Lonsdaleite
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Cleavage: |
{???} Perfect |
Color: |
Brownish black, Light brownish yellow. |
Density: |
3.3 - 3.52, Average = 3.41 |
Diaphaneity: |
Translucent to Opaque |
Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
Hardness: |
7-8 |
Luster: |
Adamantine |
Streak: |
brownish yellow |
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Optical Properties of Lonsdaleite
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Optical Data: |
Uniaxial (+/-), a=2.404, b=2.404, bire=0.0000. |
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Calculated Properties of Lonsdaleite
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Electron Density: |
Bulk Density (Electron Density)=3.52 gm/cc note: Specific Gravity of Lonsdaleite =3.52 gm/cc. |
Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
Photoelectric: |
PELonsdaleite = 0.16 barns/electron U=PELonsdaleite x rElectron Density= 0.56 barns/cc. |
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: |
01.03.06.03 (01)Native Elements |
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(01.03)with semi-metallic and non-metallic elements |
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(01.03.06)Carbon Polymorph group |
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01.03.06.01 Diamond C F d3m 4/m 3 2/m |
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01.03.06.02 Graphite C P 63/mmc 6/m 2/m 2/m |
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01.03.06.03 Lonsdaleite C P 63/mmc 6/m 2/m 2/m |
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01.03.06.04 Chaoite C P 6/mmm 6/m 2/m 2/m |
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01.03.06.05 Fullerite! C60 pseudo-CUBIC 4/m 2/m 2/m |
Strunz Class: |
01.CB.10b 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides) |
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01.C - Metalloids and Nonmetals |
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01.CB -Carbon-silicon family |
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01.CB.10b Lonsdaleite C P 63/mmc 6/m 2/m 2/m |
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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 - 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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Lonsdaleite
C
Dana No: 01.03.06.03 Strunz No: 01.CB.10b
Locality:
Notes:
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