643 - Brucite

ID	643
Mineral	Brucite
Location	Pakistan
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Brucite information at mindat.org

ID	820
Long ID	1:1:820:2
Formula	`Mg(OH)₂`
IMA Status	APPROVED GRANDFATHERED
General Appearance	Foliated leaves, frequently radiating.
Other Occurrences	Alteration mineral of periclase in marbles.
Discovery Year	1824
Diapheny	Transparent,Translucent
Cleavage	On {0001}
Tenacity	sectile
Colour	White, light greenish, grayish, bluish; honey-yellow, brownish red deep brown (manganoan varieties)
Hardness (min)	2.5
Hardness (max)	3.0
About the name	Named in 1824 by François Sulpice Beudant in honor of Archibald Bruce (February 1777 New York, New York, USA - February 22, 1818, New York, New York, USA), physician, early American mineralogist, and editor of the American Mineralogical Journal, who first described the species.
Streak	White
Crystal System	Trigonal
Cleavage Type	Perfect
Fracture type	Fibrous,Micaceous
Morphology	Usually broad tabular crystals {0001}. Often subparallel aggregates of plates. Manganoan variety sometimes acicular [0001]. Commonly foliated massive; fibrous, with fibers separable and elastic; fine granular rare.
Thermal Behaviour	Before the blowpipe, glows and becomes opaque and friable. Infusible. In a closed tube gives off water.
Comment Luster	Pearly on cleavage
Publication Year	1814
shortcode_ima	Brc

Brucite