Formula: (Ca,Th,Ce)(PO4) . H2O
Origin of name: For Maurice Brock, American geologist
Crystal system: Hexagonal
Crystal class: 622
Twinning:
Unit cell:
Colour: Deep red-brown
Diaphaneity: Translucent
Luster: Greasy to vitreous
Habit: Crystals microscopic imperfect stubby hexagonal prisms; radial aggregates of fibroid grains
Hardness:
Specific gravity: 3.9
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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