Australia, Canada, Guatemala, Italy, Kenya, Mexico, Turkey, Mexico, Guatemala, Mexico, Guatemala
Australia, Austria, Brazil, Canada, Ethiopia, Italy, Mexico, Mozambique, Southern and central Africa, Switzerland
Conchoidal, ConchoidalWalter Schumann, Conchoidal
Irregular/uneven, UnevenAnthony et al, Handbook of mineralogy (2001), Brittle, Uneven