Formula: K2(NA,Ca)2Li3Be6(PO4)6(OH)2.H2O
Origin of name: after locality Tip Top pegmatite, South Dakota, USA
Crystal system: Hexagonal
Crystal class: 6
Twinning:
Unit cell: a = 11.66 , c = 4.692
Colour: Colourless
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals acicular hexagonal prismatic, elongated, terminated by {0001}, to 3 mm, in radial sprays and divergent bundles
Hardness: about 3.5
Specific gravity: 2.65
Cleavage: None
Tenacity: Brittle, uneven fracture
Streak: White
Synonyms/varieties:
Comments: Pegmatite mineral
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