Porphyry, an igneous granite that forms when magma is exposed to air through fissures in the Earth's crust, is the latest darling of landscape designers. Essentially a fast-cooled magma, porphyry is ...
Porphyry, an igneous granite that forms when magma is exposed to air through fissures in the Earth's crust, is the latest darling of landscape designers. Essentially a fast-cooled magma, porphyry is ...
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