Common molecules sample 50644

Empirical formula:	(Al_.996Cr_.004)₂O₃
a:	4.761 Å
b:	4.761 Å
c:	12.995 Å
α (alpha):	90.00 °
β (beta):	90.00 °
γ (gamma):	120.00 °
Volume:	255.06 Å³
Space group:	R-3c
Z:	6
R(F):	0.0300
Common name:	Corundum
Short description:	Corundum is the second hardest natural mineral.
Keyword:	Ruby
Keyword:	Birthstone
Keyword:	Abrasive
Citation of a publication:	Reference: Journal of Applied Physics 49 (1978) 5823-5826 Authors: Finger, L W, Hazen, R M
Layman's explanation:	Corundum is one of the oldest gems known to man. There is evidence of a Greek scholar, Theophastus, classifying precious stones such as Rubies as early as 350 B.C. The first time Rubies were introduced in Europe was during the Greco-Roman times. Some of the best knows producers of Corundum around the world are Southeast Asia, Australia, and southern Africa. In the U.S. it is found in North Carolina and Montana. Corundum is basically used as a gemstone for jewelry, but because of the high price scientists have made an inexpensive synthetic ruby. It is also used as an abrasive because of its hardness; it is employed industrially as a component of large machines to sandpaper.
Copyright notice:	Crystallographic information obtained from CIF file from Inorganic Crystal Structure Database. ICSD Collection Code: 9770
Lab name:	Common molecules
Sample provider:	Obtained from the Inorganic Crystal Structure Database
Status:	Complete, visible to public

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