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cryptocrystalline |
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cryptocrystalline [¦krip·tō′krist·əl·ən] (geology) Having a crystalline structure but of such a fine grain that individual components are not visible with a magnifying lens. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Galena is present mainly as the common coarse-grained, well-crystallized and friable type, but also displays several other textures, such as fine-grained, sheared, massive, and 'steel' (a dense, extremely fine-grained, almost cryptocrystalline type). Gold mineralization occurs primarily in altered, pyrite-bearing argillites and occasionally siltstones, and in the underlying massive sandstones with zones of grey cryptocrystalline quartz veining and strong silicification. Gold mineralization is closely associated with pyrite in altered argillites, and occasionally in siltstones and the footwall massive sandstone where it is mainly related to zones of cryptocrystalline grey quartz veining with strong silicification haloes. |
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