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The qualities of the mysterious tourmaline are unique in the mineral realm. Fourteen years went into creating this volume, including visits to scientific collec

Tourmaline group minerals have graced the cabinets of mineral collectors and museums for untold generations. Their colors and color patterns, along with their d

Taking its name from the Latin rubellus, meaning "reddish," rubellite was rare in the ancient world. Its unique properties set it apart from other hard, red gem