Diamond Mineral Data

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General Diamond Information

Chemical Formula:

Composition:

Molecular Weight = 12.01 gm

Carbon 100.00 % C

______

100.00 %

Empirical Formula:

Environment:

Gas rich, ultra-basic diatremes from mantle depths (>30 km)and alluvial placer deposits derived from the Kimberlite rocks. Kimberlite = olivine, garnet, pyroxene, and calcite.

IMA Status:

Valid Species (Pre-IMA) Prehistoric

Locality:

Kimberly, republic of South Africa. India. Brazil. Ural Mountains, Russia. Murfreesboro, Arkansas, USA. Link to MinDat.org Location Data.

Name Origin:

From the Greek, adamas, meaning "invincible" or "hardest."

Name Pronunciation:

Diamond

Synonym:

Boart

Booart

Carbonado

Diamond Image

Images:

Diamond

Comments: Single octahedral crystal of diamond.
Location: Ghana, Africa. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Diamond

Comments: Translucent diamond penetration twin crystals.
Location: Mbuji-Mayi (Miba), Democratic Republic of the Congo (Zaire). Scale: 3.70 carats, 7x7x7 mm.
© John Betts - Fine Minerals

Images:

Diamond

Comments: Photomicrographs (PPL) of numerous microdiamonds in Kumdy-Kol caboniferous dolomite marble (Elements v1, no 2).
Location: Kokchetav Massif, Kumdy-Kol ultra high pressure facies area, northern Kazakhstan. Scale: See Image.
© Elements Magazine

Images:

Diamond Yimengite

Comments: Birefringence image of diamond displaying the location of yimengite inclusions (1, 2 , 3, 4, and 5) along the different octahedral growth zones. (Lithos, v77:181).
Location: Sese kimberlite (50 km) south of Masvingo, Zimbabwe. Scale: See Image.
© Lithos

Diamond Crystallography

Cell Dimensions:

a = 3.5668, Z = 8; V = 45.38 Den(Calc)= 3.52

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 2.06(1), 1.261(0.25), 1.0754(0.16),

Forms:

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Forms: ( 1 1 1)

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Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York

Physical Properties of Diamond

Cleavage:

{111} Perfect, {111} Perfect, {111} Perfect

Color:

Colorless, White, Gray, Black, Blue.

Density:

3.5 - 3.53, Average = 3.51

Diaphaneity:

Transparent to Subtransparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

10 - Diamond

Luminescence:

Fluorescent and phosphorescent blue, Short UV=blue, Long UV=blue.

Luster:

Adamantine

Streak:

colorless

Optical Properties of Diamond

Optical Data:

Isotropic, n=2.4175-2.4178.

Calculated Properties of Diamond

Electron Density:

Bulk Density (Electron Density)=3.52 gm/cc
note: Specific Gravity of Diamond =3.52 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

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

Diamond Classification

Dana Class:

01.03.06.01 (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.10a 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.10a Diamond C F d3m 4/m 3 2/m

Other Diamond Information

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Diamond

C
Dana No: 01.03.06.01 Strunz No: 01.CB.10a
Locality:

Notes: