Formula: (K,Na,NH4)3(AlFe3+)5(PO4)2(PO3OH)6.18H2O
Origin of name: after locality Sugarloaves, Taranaki, New Zealand
Crystal system: Hexagonal
Crystal class: 3 2/m
Twinning:
Unit cell: a = 8.7025, c = 95.05
Colour: White, gray or yellowish white
Diaphaneity: Transparent
Luster:
Habit: crystals pseudohexagaonal, lath-like, minute, rarely to 0.5 mm, massive, clay-like, pulverulent, compact
Hardness: 1-2
Specific gravity: 2.12-2.15
Cleavage: None
Tenacity: Unctuous
Streak: White
Synonyms/varieties:
Comments: structure and formula not definite, fluorescent
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