Formula: FeS.Ca(OH)2.Al(OH)3
Origin of name: for Leonid N. Vyalsov (1939-), Russina microscopist (specialist in reflected light optics) and mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m /2m 2/m
Twinning:
Unit cell: a = 14.2, b = 20.98, c = 5.496
Colour: Crimson, red
Diaphaneity: Opaque
Luster: Submetallic
Habit: Tiny grains 5-10 to 100-150 micron and in clusters
Hardness:
Specific gravity: 1.96
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: identified in polished sections only
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