Formula: NaCaMn3Si5O14(OH)
Origin of name: Named for Marion Stuart of Bellvue, Idaho, who has been a staunch supporter of the preservation of natural history specimens, particularly those of geological interest.
Crystal system: Triclinic
Crystal class: 1 or 1
Twinning:
Unit cell: a = 7.7, b = 12.03, c = 6.78, α = 85.26°, β = 94.1°, γ = 111.04°
Colour: White to light pink
Diaphaneity: Transparent to translucent
Luster: Vitreous, frosty on tips of crystals
Habit: Crystals bladed prismatic, to 0.5mm; overgrowths on rhodonite
Hardness: ~ 6
Specific gravity: 3.46
Cleavage: 2; {100} and {001} imperfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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