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Blender 2.5 Materials and Textures Cookbook by Colin Litster

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Creating a mask to represent the quartz veins

The layered quartz is quite common in gray sandstone and can be found in many pebbles scattered across a beach. The layers of quartz were laid down over the millennia, sometimes in thick layers, and sometimes thin. Earthquake movement altered the angles of the rock layers as these quartz deposits were being laid. As a result the quartz layers are occasionally at varying angles to each other. The quartz layers also have flecks of broken rock, some containing iron or sulphur deposits, which give a slightly yellow color variation.

The quartz part of these pebbles is worn more because its density is lower than the gray sandstone in which it is encased. Because the pebble has been tossed and polished by ...

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