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aphanitic |
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aphanitic [‚af·ə′nid·ik] (petrology) Referring to the texture of an igneous rock in which the crystalline components are not distinguishable by the unaided eye. 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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At San Diego, silica flooding and hairline quartz veinlets obscure breccated aphanitic rock in four outcrops that protrude through shallow soil and elluvial cover over a 20 x 30 meter area. The vein follows a North 60 West trending structure that is up to 50 meters wide and together with a dark gray, aphanitic trachyte porphyry dike cuts fractured, sheared, and hornfelthized andesite and diorite wall rocks. Breccia fragments consist of grey sandstone or shale, minor fragments of aphanitic dacite with minor pyrite, and veinlets of quartz. |
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