Formula: NaK(Be,Al)Zr2(PO4)4.2H2O
Origin of name: for Alfred Selwyn, Australian geologist
Crystal system: tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell:
Colour: purplish blue
Diaphaneity: transparent
Luster: vitreous
Habit: cavity fillings of intergrowths of indistinct radiating crystals and granular aggregates
Hardness: 4
Specific gravity: 2.94
Cleavage:
Tenacity:
Streak: pale lavender
Synonyms/varieties:
Comments: K analogue of gainesite
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