Origin of the segmental coloration of amethyst and smoky quartz. American Museum novitates ; no. 758

Frondel, Clifford, 1907-2005-10-062005-10-061934http://hdl.handle.net/2246/459215 p. : ill. ; 24 cm.Includes bibliographical references (p. 14-15).2216321 bytesapplication/pdfen-USQL1 .A436 no.758, 1934Amethysts.Quartz crystals.Color.Quartz.Crystallography.Origin of the segmental coloration of amethyst and smoky quartz. American Museum novitates ; no. 758Coloration of amethyst and smoky quartztext