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Lonsdaleite Mineral Data

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General Lonsdaleite Information

Help on Chemical  Formula: Chemical Formula: C
Help on Composition: Composition: Molecular Weight = 12.01 gm
   Carbon 100.00 %  C
          100.00 % 
Help on Empirical Formula: Empirical Formula: C
Help on Environment: Environment: Associated with diamond in the Canyon Diablo, Goalpara, and Allan Hills 77283 meteorites. Also in diamond-bearing placers.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Tunguska impact site, Russia. Other world-wide impact sites. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Kathleen Lonsdale (1903-1971), English crystallographer.
Help on Name Pronunciation: Name Pronunciation: Lonsdaleite + Pronunciation Say LONSDALEITE
Help on Synonym: Synonym: ICSD 27422
  PDF 19-268

Lonsdaleite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


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.

Lonsdaleite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.63492
Help on Cell Dimensions: Cell Dimensions: a = 2.52, c = 4.12, Z = 4; V = 22.66 Den(Calc)= 3.52
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.06(1), 2.19(1), 1.26(0.75),

Physical Properties of Lonsdaleite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Brownish black, Light brownish yellow.
Help on Density: Density: 3.3 - 3.52, Average = 3.41
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 7-8
Help on Luster: Luster: Adamantine
Help on Streak: Streak: brownish yellow

Optical Properties of Lonsdaleite

Help on Optical Data: Optical Data: Uniaxial (+/-), a=2.404, b=2.404, bire=0.0000.

Calculated Properties of Lonsdaleite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.52 gm/cc
note: Specific Gravity of Lonsdaleite =3.52 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELonsdaleite = 0.16 barns/electron
U=PELonsdaleite x rElectron Density= 0.56 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lonsdaleite is Not Radioactive

Lonsdaleite Classification

Help on  Dana Class: Dana Class: (01)Native Elements
  (01.03)with semi-metallic and non-metallic elements
  (01.03.06)Carbon Polymorph group Diamond C F d3m 4/m 3 2/m Graphite C P 63/mmc 6/m 2/m 2/m Lonsdaleite C P 63/mmc 6/m 2/m 2/m Chaoite C P 6/mmm 6/m 2/m 2/m Fullerite! C60 pseudo-CUBIC 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 01.CB.10b 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.10b Lonsdaleite C P 63/mmc 6/m 2/m 2/m

Other Lonsdaleite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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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Dana No: Strunz No: 01.CB.10b





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