gemstone
Pink Tourmaline (Rubellite)
Elbaite (Complex Borosilicate)
Hardness 7 to 7.5 on the Mohs scale, pink to red color, vitreous luster, trigonal crystal structure, poor cleavage, specific gravity 3.06.
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Physical properties
Hardness 7 to 7.5 on the Mohs scale, pink to red color, vitreous luster, trigonal crystal structure, poor cleavage, specific gravity 3.06.
Formation & geological history
Formed in granitic pegmatites and some metamorphic rocks under high heat and pressure, typically rich in lithium and varying levels of manganese which imparts the pink color.
Uses & applications
Predominantly used as a gemstone in fine jewelry, highly valued by mineral collectors in un-cut crystal form, and sometimes used in scientific equipment requiring piezoelectric properties.
Geological facts
Pink tourmaline is one of October's birthstones. It was highly prized by the last Empress of China, Dowager Tz'u Hsi, who imported massive quantities from California in the early 1900s.
Field identification & locations
Identified by its distinctive pink color, strong pleochroism (showing different colors from different angles), and typical striations along the length of the crystal when rough. Found globally, notably in Brazil, Madagascar, Afghanistan, and California.
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