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Tourmaline naturally occurs in a full color spectrum and is used as both a trade name and as a gemological name for a group of minerals of varying species Different forms of tourmaline may carry different metaphysical properties
including Diamond
It is made up of Calcite or Calcium Carbonate
It is composed of silicon dioxide
Prehnite 8mm Round Faceted A Grade - 15-16 Inch Stone Type_Beryl Tourmaline naturally occurs in aPrehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is translucent to transparent, in colors from light green to yellow green to olive, with occasional inclusions of Black Tourmaline that crisscross the stone in fibrous patterns. It is a phyllosilicate composed of silicon, calcium and aluminum with trace amounts of iron.
