Formula: (Ba,Sr)2TiMn2(SiO4)2(PO4,SO4)(OH,Cl)
Origin of name: for Toyafumi Yoshimura, Professor of Mineralogy, Kyushu University (Japan).
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 5.386, b = 6.999, c = 14.748, α = 89.98°, β = 93.62°, γ = 95.5°
Colour: Orange-brown
Diaphaneity: Transparent to translucent
Luster:
Habit: mica-like or bladed, to 5 cm
Hardness: 4.5
Specific gravity: 4.13
Cleavage: 3; {010} perfect, {101} and {10-1} distinct
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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