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†Tourmaline is unusual in that it is both pyroelectric and piezoelectric
olive green and gray to green
botryoidal
Named for the village near where it is found in Madagascar
Rainbow Sapphire 4mm Round Faceted - 15-16 Inch Abundance †Tourmaline is unusual inSapphires are precious gemstones, but unlike rubies, they come in a rainbow of colors besides red! They are all varieties of the mineral corundum, known for its incredible hardness, second only to diamond . This makes sapphires very durable and scratch resistant. Formed deep underground during the cooling of magma, sapphires get their various colors from trace elements. Iron gives them blue, the most famous sapphire color, while titanium can create