Formula: Ca4B10O19.20H2O
Origin of name: for Herman Tertsch (1880-1962), Austrian mineralogist
Crystal system: Monoclinic
Crystal class: unknown
Twinning:
Unit cell:
Colour: Snow-white
Diaphaneity: Translucent
Luster: Silky
Habit: massive, Fibrous, resembles ulexite
Hardness:
Specific gravity:
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments: fluoresces light to deep blue-violet under SW-UV light, slightly soluble in hot water
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