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Penikisite
Penikisite was discovered by Alan Kulan and Gunar Penikis near Rapid Creek, Yukon Territory. The mineral is a member of the bjarebyite group along with kulanite, ideally BaFe2+2Al2(PO4)3(OH)3, and bjarebyite, ideally BaMn2+2Al2(PO4)3(OH)3.〔Elliott, P. & Willis A.C., (crystal structure of perloffite" ), ''Mineralogical Magazine'', 2011〕 It is among several new minerals that have been discovered in the Rapid Creek and Big Fish areas of Yukon Territory. Kulanite is similar in many ways to penikisite in appearance and properties. The chemical formula for penikisite is Ba(Mg,Fe,Ca)Al2(PO4)2(OH)3.〔Mandarino, J.A., Sturman, B.D. & Corlett, M.I., (the magnesium analogue of kulanite, from the Yukon Territory" ), ''Can. Mineral'', 1977〕 It has a hardness of about 4 and a density of 3.79 g/cm3.〔 Penikisite is triclinic and has a biaxial optical class.〔Anthony, John W., Richard A., Kenneth W. and Nichols, Monte C. Eds., (), ''Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA'', 2001-2005〕 It comes in shades of blue and green and, when rubbed on a streak plate, is pale green to white in color.〔 Although penikisite and kulanite both range from blue to green, penikisite zones are easily distinguishable from kulanite zones in kulanite-penikisite crystals because they are lighter than the darker kulanite in color.〔 Penikisite is a phosphate and is different from kulanite in that it is a magnesium-rich phosphate whereas kulanite is an iron-rich phosphate.〔
==Introduction==
Penikisite, ideally Ba(Mg,Fe,Ca)Al2(PO4)2(OH)3, is a second occurrence of kulanite.〔 Both kulanite and penikisite are members of the bjarebyite group.〔 Minerals in the bjarebyite group have the general formula XY2Z2(PO4)3(OH)3 where X=Ba, Y=Mg, Fe2+, Mn2+, and Z=Al, Fe3+.〔Cooper M. & Hawthorne F.C., (of the crystal structure of kulanite" ), ''Can. Mineral'', 1994〕 Penikisite was found in a Yukon phosphate deposit near Rapid Creek. The mineral, along with kulanite, occurs in an iron-formation.〔Robertson, B.T. (of epigenetic phosphate minerals in a phosphatic iron-formation, Yukon Territory" ), ''Mineral. Rec.'', 1982〕 In these iron-formations, Mg-rich zones were discovered and named penikisite in honor of Gunar Penikis who discovered these phosphate occurrences with Alan Kulan.〔
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