Lonsdaleite Mineral Data

Advertisment

For more than thirty (30) years, Excalibur Mineral Corp. has been providing private collectors, researchers, major universities and museums throughout the world with reliably identified, rare and unusual mineral samples for science an

McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

Adamsminerals.com- Online mineral store front for mineral collectors

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.

Name Pronunciation:

Lonsdaleite + Pronunciation

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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Bundy F P , Kasper J S , Journal of Chemical Physics , 46 (1967) p.3437-3446, Hexagonal diamond-a new form of carbon

Physical Properties of Lonsdaleite

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

Optical Properties of Lonsdaleite

Optical Data:

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

Calculated Properties of Lonsdaleite

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:

PE_Lonsdaleite= 0.16 barns/electron
U=PE_Lonsdaleite x rElectron Density= 0.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lonsdaleite is Not Radioactive

Lonsdaleite Classification

Dana Class:

01.03.06.03 (01)Native Elements

(01.03)with semi-metallic and non-metallic elements

(01.03.06)Carbon Polymorph group

01.03.06.01 Diamond C F d3m 4/m 3 2/m

01.03.06.02 Graphite C P 6₃/mmc 6/m 2/m 2/m

01.03.06.03 Lonsdaleite C P 6₃/mmc 6/m 2/m 2/m

01.03.06.04 Chaoite C P 6/mmm 6/m 2/m 2/m

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)

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

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

Search for Lonsdaleite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Lonsdaleite :

A Bijoux Google Search for Lonsdaleite
Adam's Minerals Google Search for Lonsdaleite
Cape Minerals Google Search for Lonsdaleite
Dakota Matrix Minerals Google Search for Lonsdaleite
Excalibur Mineral Corp. Google Search for Lonsdaleite
Exceptional Minerals Google Search for Lonsdaleite
John Betts Fine Minerals Search for Lonsdaleite
McDougall Minerals Google Search for Lonsdaleite
Mineral News Website Link
Rock and Mineral Shows Google Search for Lonsdaleite
Weinrich Minerals, Inc. Google Search for Lonsdaleite

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: 01.03.06.03 Strunz No: 01.CB.10b
Locality:

Notes: