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- Porphyry
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"Imperial Porphyry" from the Red Sea Mountains of Egypt A waterworn cobble of porphyry Rhyolite porphyry from Colorado; scale bar in lower left is 1 cm (0.39 in) Igneous porphyry from the Hunter Mountain pluton in the Last Chance Range in Death Valley National Park
Porphyry (/ˈpɔːrfəri/ POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass. In its non-geologic, traditional use, the term porphyry usually refers to the purple-red form of this stone, valued for its appearance, but other colours of decorative porphyry are also used such as "green", "black" and "grey".
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igneous rock
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Istanbul Archaeology Museums
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aphanite
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quartz monzonite
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tachylite
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Norway
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Egypt
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Rome
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Napoleon
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Florence
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Renaissance
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Mount Kilimanjaro
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