Lonsdaleite Mineral Data

Lonsdaleite Mineral Data +

[Mineral Specimens] [Mineral Locations] [About Us] [Search] [Register]
Greenside Minerals
Newest website on the Internet for top quality, affordable minerals from around the World
We specialize in minerals from the UK and Ireland

General Lonsdaleite Information

Chemical Formula:

Composition:

Molecular Weight = 12.01 gm

Carbon 100.00 % C

______

100.00 %

Empirical Formula:

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

Images:

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.

Lonsdaleite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.06(1), 2.19(1), 1.26(0.75),

Physical Properties of Lonsdaleite

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

Optical Data:

Uniaxial (+/-), a=2.404, b=2.404, bire=0.0000.

Calculated Properties of Lonsdaleite

Electron Density:

r_electron=3.52 gm/cc
note: r_Lonsdaleite=3.52 gm/cc.

Fermion Index

Fermion Index = 0.011
Boson Index = 0.989

Photoelectric:

PE_Lonsdaleite= 0.16 barns/electron
U=PE_Lonsdaleite x r_electron= 0.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lonsdaleite is Not Radioactive

Lonsdaleite Classification

Dana Class:

1.3.6.3 (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.02-50 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 Lonsdaleite Information

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 - 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 Lonsdaleite using:

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

Visit our Advertisers for Lonsdaleite :

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 Lonsdaleite Mineral Data :

Ask about Lonsdaleite 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 Lonsdaleite Specimen Label here :

Lonsdaleite

C
Dana No: 1.3.6.3 Strunz No: I/B.02-50
Locality:

Notes: