Formula: Ca(Ca,Mn)(SiO3OH)(OH)
Origin of name: for Arie Poldervaart, American geologist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless, milky white
Diaphaneity: transparent
Luster: subvitreous, vitreous on fracture
Habit: prismatic euhedral, wheat sheaf polycrystals
Hardness: 5
Specific gravity: 2.91
Cleavage: none
Tenacity:
Streak: white
Synonyms/varieties:
Comments: fluoresces distinct deep red under SW ultraviolet light
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