Opals

LC control no.	sh 85094861
LC classification	QE394.O7 Mineralogy TN997.O7 Mineral resources TS755.O73 Precious stones
Topical heading	Opals *Browse this term in* LC Authorities or the LC Catalog
See also	Precious stones *Browse this term in* LC Authorities Silicate minerals *Browse this term in* LC Authorities