Gearksutite, Quartz

Locality: Kara-Oba W deposit, Betpakdala Desert (Bet-Pak-Dal Desert), Karagandy Province (Qaragandy Oblysy; Karaganda Oblast'), Kazakhstan

Snow-white ultramicro-fibrous compact gearksutite agregate. It was formed during interaction of HF (produced by pyrite oxidation in fluorite matrix) with concretion of allophane or caoline into quartz-muscovite greisen. Associating minerals are quartz crystals and muscovite, forming crust of the concretion. Specimen size is 4x2x1.5 cm. Collected by Lidia P. Ermilova in August of 1958 on dumps of vein #1 of the deposit. Pavel M. Kartashov collection and photo.

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Photo added: 27th Jan 2008

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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