Formula: Mg3(SiO4)(F,OH)2
Origin of name: after locality Norberg, Sweden
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: tan, yellow, yellow-orange, orange-brown
Diaphaneity: transparent to translucent
Luster: vitreous to somewhat resinous
Habit: crystals varied habit, highly modified, rounded grains
Hardness: 6 to 6.5
Specific gravity: 3.177
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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