Crystal & Stones

Natural orthoclase feldspar crystal from Itrongay, Madagascar; Rob Lavinsky, CC BY-SA 3.0 — Roosters Peacock crystal guide
Orthoclase: The Stone of Structure, Clear Priorities & Steady Direction
Orthoclase is a potassium-rich feldspar with characteristic cleavage and a Mohs hardness of 6. Learn its geology, naming history, care, and modern associations with structure, priorities, and direction. Read more...