k Graphic tourmaline, light micrograph Thin section polarised light micrograph of a rock containing tourmaline or turmaline crystals in a graphic pattern. Like in the betterknown graphic granite this pattern results from the simultaneous crystallization of two or more minerals in a melt at a critical temperature, the eutectic point, during cooling of that melt. Actual size is 35 x 48 mm., by DIRK WIERSMASCIENCE PHOTO LIBRARY Stock Photo - Afloimages
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Graphic tourmaline, light micrograph Thin section polarised light micrograph of a rock containing tourmaline  or turmaline  crystals in a graphic pattern. Like in the better known graphic granite this pattern results from the simultaneous crystallization of two or more minerals in a melt at a critical temperature, the eutectic point, during cooling of that melt. Actual size is 35 x 48 mm., by DIRK WIERSMA SCIENCE PHOTO LIBRARY
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Graphic tourmaline, light micrograph

Thin section polarised light micrograph of a rock containing tourmaline (or turmaline) crystals in a graphic pattern. Like in the better-known graphic granite this pattern results from the simultaneous crystallization of two or more minerals in a melt at a critical temperature, the eutectic point, during cooling of that melt. Actual size is 35 x 48 mm., by DIRK WIERSMA/SCIENCE PHOTO LIBRARY

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