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→Sources: clean up & uniformity
=Sources=
=Sources=
*Arem, Joel E. ''Color Encyclopedia of Gemstones'', Litton Educational Publishing, Inc.:New York (1977), ''p. xxv''
*Arem, Joel E. ''Color Encyclopedia of Gemstones'', Litton Educational Publishing, Inc.:New York (1977), ''p. xxv''
[[category:Crystallography]]
[[Category:Crystallography]]