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Chemical formulaMg(OH)2
Colorwhite, pale green, blue, gray; honey-yellow to brownish red
Crystal habitplaty or foliated masses and rosettes - fibrous to massive
Crystal systemTrigonal (Hexagonal Scalenohedral)
Cleavageperfect 0001
Mohs Scale hardness2.5 to 3
Lustervitreous to pearly
Refractive indexnω = 1.560 nε = 1.580
Optical PropertiesUniaxial (+)
Birefringence0.020 max.
Specific gravity2.39 to 2.40
Other CharacteristicsPyroelectric

Brucite is the mineral form of magnesium hydroxide, with the chemical formula Mg(OH)2. It is pearly white or pale green in colour, translucent, with perfect cleavage, and tabular crystals or massive. It has a hardness of 2.5.

Brucite is a common alteration product of periclase in marble; a low-temperature hydrothermal vein mineral in metamorphosed limestones and chlorite schists; and formed during serpentinization of dunites. Brucite is often found in association with serpentine, calcite, aragonite, dolomite, magnesite, hydromagnesite, artinite, talc, and chrysotile. Notable locations include Wood's Chrome Mine, Cedar Hill Quarry, Lancaster County, Pennsylvania.

Brucite was first described in 1824 and named for the discoverer, American mineralogist, Archibald Bruce (1777-1818).

See also


  • Mindat
  • Webmineral data
  • Mineral Data Publishing
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Brucite". A list of authors is available in Wikipedia.
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