Formula: (Ce,La,Ca)BSiO5
Origin of name: for F. Stillwell, Australian mineralogist
Crystal system: hexagonal
Crystal class: 3
Twinning:
Unit cell:
Colour: lavender gray, brownish yellow
Diaphaneity: translucent
Luster: resinous
Habit: crystals rhombohedral, to 5 mm, massive, compact
Hardness: 6.5
Specific gravity: 4.61
Cleavage: 1; imperfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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