Formula: KMg2Al2Ti(PO4)4(OH)3 . 15H2O
Origin of name: For Joseph Matienne, French mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Yellow-brown
Diaphaneity:
Luster: Bright
Habit: Fibrous, radiating, forming spheres to 1 mm
Hardness:
Specific gravity: 2.31
Cleavage: 2; {001} perfect, {010} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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