Formula: Ba(Mg,Fe)2Al2(PO4)3(OH)3
Origin of name: for G. Penikis, Canadian prospector
Crystal system: triclinic
Crystal class: 1
Twinning:
Unit cell:
Colour: blue to green
Diaphaneity: transparent to translucent
Luster: vitreous
Habit: crystals complex, forms identical to kulanite
Hardness: about 4
Specific gravity: 3.79
Cleavage: 2; {010} and {100} fair to good
Tenacity:
Streak: pale green to white
Synonyms/varieties:
Comments: series with kulanite
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