Stunning combination of Amazonite crystals with Smoky Quartz and Albite!

Formula: KAlSi3O8
System: Triclinic
Colour: White, grey, greyish ...
Lustre: Vitreous
Hardness: 6 - 6½
Member of: Feldspar Group
Name: Named in 1830 by Johann Friedrich August Breithaupt to a reddish to brownish feldspar from Arendal, Norway and a feldspar with bluish schiller from Stavern (formerly Fredrichsvärn)

From Sentinel Rock, El Paso County, Colorado.