Microcline
Something about color in amazonite - few distinctive localities, the two used in this jewelry from Colorado and Virginia - pegmatite granite -
beautiful crystals - individuals and in clusters - 
Feldspar is a rock-forming mineral comprising about 67% of the earth's crust. Important in ceramics, .......amazonite as a gemstone is because of its color - relatively soft so used in necklaces.
Chaffee County
Colorado, United States
Mineral collectors – both professional and amateurs – prowl the mountains of Colorado in search of fine mineral specimens of this beautiful turquoise-colored mineral which is commonly found with smoky quartz.