India, China
Tanzania, Kenya, Madagascar, Cambodia, Sri Lanka, Burma, Thailand, Vietnam, Australia
Blue, Yellow, Brown, gray, Reddish, Greenish
Blue, Green, Yellow, Brown, White, Colorless, Blue, Red, Green, Yellow, pink, Yellow, Red, Brown, Green, Blue, Reddish, gray
Not Available
Sagittarius, Virgo, Sagittarius, Virgo, Sagittarius, Virgo
(e.g. graphite).
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)