Formula: Cu3Al4(PO4)2(OH)12.2H2O
Origin of name: for Robert Sielecki, Australian geologist
Crystal system: triclinic
Crystal class: unknown
Twinning:
Unit cell:
Colour: deep sky-blue to royal blue
Diaphaneity: translucent
Luster:
Habit: crystals 10 to 100 micron long by 1 to 2 micron across forming spheres to 0.5 mm with radiating structure
Hardness: 3
Specific gravity: 3.02
Cleavage: none
Tenacity:
Streak: pale blue
Synonyms/varieties:
Comments:
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