Nifontovite

Formula: Ca₃B₆O₆(OH)₁₂.2H₂O

Origin of name: for R. Nifontov, Russian geologist

Crystal system: monoclinic

Crystal class: 2/m

Twinning: 

Unit cell: a = 13.09 Å, b = 9.49 Å, c = 13.53 Å, b = 119.5°

Colour: colourless

Diaphaneity: 

Luster: vitreous

Habit: massive

Hardness: 3.5

Specific gravity: 2.36

Cleavage: 1; poor

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: fluoresces violet under LW ultraviolet light