Polarite

Polarite (Pd,(Bi,Pb)), is an opaque, yellow-white mineral. Its crystals are orthorhombic pyramidal, but can only be seen through a microscope. It has a metallic luster and leaves a white streak. Polarite is rated 3.5 to 4 on the Mohs Scale.^[2][3]

Polarite
General
Category	Alloys with PGE
Formula (repeating unit)	Pd,(Bi,Pb)
Strunz classification	02.AC.40
Crystal system	Orthorhombic
Crystal class	Pyramidal (mm2) (same H-M symbol)
Space group	Ccm21
Unit cell	a = 7.19 Å, b = 8.69 Å, c = 10.68 Å; Z = 16
Identification
Color	White with yellowish tint
Crystal habit	Disseminated grains (microscopic)
Mohs scale hardness	3.5 - 4
Luster	Metallic
Streak	White
Diaphaneity	Opaque
Specific gravity	12.51
References	[1][2][3][4]

It was first described in 1969 for an occurrence in Talnakh, Norilsk in the Polar Ural Mountains in Russia.^[2] It has also been recorded from the Bushveld igneous complex of South Africa and from Fox Gulch, Goodnews Bay, Alaska. 

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.