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Mineral Y from Crestmore Quarry?

Posted by Chris Stefano  
avatar Mineral Y from Crestmore Quarry?
January 10, 2007 04:04AM
a friend of mine recently acquired a fluorescent specimen labeled simply Mineral Y from Crestmore Quarry, California. The fluorescence is purple (sw) Appears as a whitish coating on rock. Anyone have any idea what this stuff is?

Alan Guisewite
Re: Mineral Y from Crestmore Quarry?
June 05, 2007 05:49PM
Hi Chris,

I just won a piece on eBay - from the description:

Mineral Y refers to tentative names given to unidentified Crestmore
minerals by Josoeu Munooctt in his 1961 article in the "American
Mineralologist". He describes mineral Y as a "copper bearing
calcium silicate hydrate". I have not been able to find a newer name
for this mineral. It has a very distinctive fluorescence among Crestmore
Minerals so should be fairly easy to identify if you can find newer

I don't have a copy of that article, but I hope this helps!

avatar Re: Mineral Y from Crestmore Quarry?
June 08, 2007 01:15AM
I also have a sample of mineral Y as well as Mineral Z that came from Fred DeVitos collection. Does anyone have any further information on mineral Z?
Re: Mineral Y from Crestmore Quarry?
February 11, 2012 05:38AM
Dr. Kampf of the Natural History Museum of los Angeles County reports that Miner Y is equivalent (or very similar) to Whelanite.

John Betts
Re: Mineral Y from Crestmore Quarry?
February 11, 2012 02:04PM
avatar Re: Mineral Y from Crestmore Quarry?
February 11, 2012 02:15PM
I presume the article referred to is Am Min 46(3,4):245, "Crestmore, past and present" by Joseph Murdoch, available here: [www.minsocam.org]

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