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Plane polarized light and backscattered electron image (BEI) of tourmalines that fill veins from the carapace of the Geyser felsite. The tourmalines display oscillatory zoning that reflects chemical changes from schorl (dark gray in BSI) to foitite (light). Image: B. Dutrow and D. Henry

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Uploaded: Apr2 10

Last Modified: 2010-04-02 15:47:05
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B. Dutrow and D. Henry
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