General Information:
Chemical Formula:
BaMg2Al2(PO4)3(OH)3
Composition:
(Molecular Weight = 583.72 gm)
Barium 23.53 % Ba
Magnesium 7.29 % Mg
Aluminum 9.24 % Al
Iron 2.39 % Fe
Phosphorus 15.92 % P
Hydrogen 0.52 % H
Oxygen 41.11 % O
Empirical Formula:
BaMg1.75Fe2+0.25Al2(PO4)3(OH)3
Environment:
Forms a series with kulanite (Fe-end member).
IMA Status:
Approved IMA 1977
Locality:
Rapid Creek (Cross Cut Creek), Big fish River, Yukon Territory, Canada.
Name Origin:
Named for Gunar Penikis (1936-1979), who discovered the locality.
Physical Properties:
Cleavage:
[010] Good, [110] Good
Color:
blue or green.
Density:
3.79
Diaphaniety:
Transparent to Translucent
Habits:
Platy - Sheet forms (e.g. micas)., Rosette - Bundled tabular aggregates resembling rose flower petals.,
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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