Wikidata facts
- Subclass of
- igneous rock
- Has part
- granite porphyry
- Image
- Särna-Porphyr P1000115.JPG
Show 3 more facts
- Commons category
- Porphyry
- described by source
- New International Encyclopedia
- has characteristic
- porphyric texture
Sources (2)
via Wikidata · CC0
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Encyclopedic overview
"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".
Excerpted from Wikipedia’s “porphyry” article, available under the CC BY-SA 4.0 licence.