Formula: (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12 . 4H2O
Origin of name: After locality; Buranga pegmatite, Rwanda
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Bluish to bluish green
Diaphaneity:
Luster:
Habit: Crystals long prismatic, with an hour-glass structure and blue core
Hardness: 5
Specific gravity: 3.05
Cleavage: 1; {100} perfect
Tenacity:
Streak: Bluish
Synonyms/varieties:
Comments:
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