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Opal from
Grand Central Mine, Contention-Grand Central Mine group, Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA

Description
Comments:Occurs as a component of quartz-adularia-opal rock formed by alteration of granodiorite.
Quality of samples:not specified / average specimens
Confirmation
Validity:Believed Valid
References
References:Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 421; Williams, S.A. (1979), Girdite, oboyerite, fairbankite, and winstanleyite, four new tellurium minerals from Tombstone, AZ, Min.Mag.: 43: 453-457.
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Grand Central Mine, Contention-Grand Central Mine group, Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA
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Current server date and time: 16th Feb 2012 18:00:47
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