Nepheline Syenite
Nepheline Syenite from 1 mile NE of Etta Mine, Keystone District, Pennington County, South Dakota
Collection John Betts - Fine Minerals
Description Specimen of Nepheline syenite containing a mixture of several minerals. Nalle suggested the presence of Riebeckite, Nepheline, and Cancrinite, etc. Ex. Peter B. Nalle (1923-2010) collection #334; collected 1946.
Locality 1 mile NE of Etta Mine, Keystone District, Pennington County, South Dakota
Dimensions 7 x 7 x 3 cm.
Specimen Grade A
Photograph © www.johnbetts-fineminerals.com - All Rights Reserved.

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