Mineral Information and Data:

Lonsdaleite
C [CNMNC approved formula]

Named to honor Professor Kathleen (Yardley) Lonsdale (1903–1971), distinguished British crystallographer, University of London, London, England.

IMA status : Approved Species 1967 (IMA1966-044)
CLASSIFICATION 
Dana
(8th edition) :
01.03.06.03  
  (01) Native Elements
  (01.03) with semi-metallic and non-metallic elements
  (01.03.06) Carbon Polymorph group
  
Nickel-Strunz
(10th edition) :
01.CB.10b
  (01) Elements
  (01.C) Metalloids and Nonmetals
  (01.CB) Carbon-silicon family
  
Crystal system: Hexagonal System
Point group (H-M): 6/mmm (or 6/m 2/m 2/m) — dihexagonal-dipyramidal
Space group: P63/mmc
Unit cell: a = 2.51 Å, c = 4.12 Å, Z=4
Crystal Habit: Very fine-grained aggregates, forming cubes and cubo-octahedra, to 0.7 mm; in polycrystalline aggregates, mixed with diamond.
  
Color: Grayish in crystals; also pale yellowish or brown in broken fragments
Diaphaneity: Transparent
Luster: Adamantine
Hardness (Mohs): 3
Measured Density: > 3.20 g/cm3
  
Polymorphism and Series: Polymorphous with diamond, graphite, and chaoite.
Geologic Setting: Discovered in the residue (ca. 200 mg) from the dissolution of 5 kg of Cañon Diablo meteorite. The mineral may be formed by impact shock, or be a product of direct
crystallization in the parent body.
Mineral Association: Schreibersite, cohenite, taenite, graphite, chromite, kosmochlor, sphalerite, black diamond (Cañon Diablo); troilite, graphite, diamond, schreibersite, cohenite (Allan Hills 77283).
  

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