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Schorl : Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH), Quartz : SiO2, Albite : NaAlSi3O8

Copyright © 1987 Kenneth L. Gochenour
 
 
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Schorl : Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH), Quartz : SiO2, Albite : NaAlSi3O8

Copyright © 1987 Kenneth L. Gochenour  - This image is copyrighted. Unauthorized reproduction prohibited.

Caption: Schorl and quartz crystals on a feldspar (albite) matrix. Largest tourmaline crystal is 9 inches long. Source: Gochenour, K. 1988. Black Tourmaline from Little Cahuilla Mountain, Riverside County, California. Rocks and Minerals, 63 (6): p. 443.

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Photo added: 10th May 2009