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porphyry |
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porphyryAny igneous rock containing large crystals in a finer matrix. 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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Despite the inclusion of statements such as 'all contain sanidine in the groundmass as well as significant amounts of plagioclase . 3) Pyrite occurs as disseminations in the groundmass of the intrusive and also within the matrix of the meta-sediments (hornfels). Disseminated arsenopyrite and pyrite occurs in the groundmass of the porphyry and is related to the fracturing and subsequent alteration. |
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