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Cordierite: Mg2Al4Si5O18
Comments: Piece of near-gem-quality glassy gray-blue cordierite with some yellowish internal reflections. Location: Mt. Bity District, Madagascar. Scale: Overall: 2 x 1 x 1.5 cm. © Tom Loomis / Dakota Matrix
Comments: Brown rectangular cordierite crystals in matrix. These crystals are not gemmy enough to be called iolite. Location: Richmond Soapstone Quarry, Richmond, Cheshire Co., New Hampshire, USA. Scale: 24x20x15 mm. © John Betts - Fine Minerals