Orthoclase is a silicate, potassium feldspar, closely related to Moonstone and Amazonite. 

Orthoclase is a form of feldspar which crystallises in the form of masses, plate-like layers, short prismatic crystals, and thin tabular crystals. The colour ranges includes white, colourless, grey, yellow, pink, and green.

Orthoclase is said to be a bringer of peace in times of emotional upheaval. 
Claimed for centuries in different cultures to be a healer of all ills.