General Information:
Chemical Formula:
MgO
Composition:
(Molecular Weight = 40.30 gm)
Magnesium 60.30 % Mg
Oxygen 39.70 % O
Empirical Formula:
MgO
Environment:
Contact metamorphism of dolomites and magnesites.
Locality:
Monte Somma and Predazzo, Italy.
Name Origin:
From the Greek peri - "around" and klao - "to cut."
Physical Properties:
Cleavage:
[001] Perfect, [010] Perfect, [100] Perfect
Color:
brownish yellow, colorless, green, gray white, or yellow.
Density:
3.67 - 3.9, Average = 3.78
Diaphaniety:
Transparent to translucent
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., ,
Hardness:
6 - Orthoclase
Luminescence:
Fluorescent, Long UV=light yellow.
Luster:
Vitreous (Glassy)
Streak:
white
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