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Has its own Group, named from Greek "sphaleros", treacherous, in allusion to the ease with which dark varieties were mistaken for galena, but yielded no lead. Sphalerite Group - Sphalerite, also known as Blende or Zinc Blende, is the major ore of zinc. When pure can forms clear crystals with colours ranging from pale yellow to orange and red shades, but as iron content increases it forms dark, opaque metallic crystals (known as Marmatite).
The Image here shows red and orange Sphalerite crystals with Galena.