Home Periclase
IV - Hydroxides		 Crystal habit of Periclase
 
Name   Periclase
Chemistry   MgO
Hardness   6
Lustre   vitreous to adamantine
Colour   colourless, white, grey, yellow to brown or black
Streak   white 
Density [g/cm3]   3.6
Crystal habit   isometric, crystals as cubes or octahedrons
Cleavage, Fracture   [100], [010], [001] perfect
other characteristics and occurrences   contact metamorphic mineral, formed at high temperature from dolomite (CaMg(CO3) -> periclase (MgO) + calcite (CaCO3) + CO2, changes easily to brucite (Mg(OH)2) in presence of humidity
   
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