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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). Porphyry (/ ˈ p ɔːr f ə r i / 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.
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The dominant green epidote in unakite rocks is the metasomatic alteration product of plagioclase feldspar, while the orthoclase and quartz crystals remain unaffected. Distribution [ edit ]
Ailsa Craig produced two types of granite for curling, Blue Hone and Ailsa Craig Common Green. Blue Hone, which is unique to Ailsa Craig, has very low water absorption, which prevents the action of repeatedly freezing water from eroding the stone. [65] Ailsa Craig Common Green is a lesser quality granite than Blue Hone.
Kays inserts Ailsa Craig Blue Hone granite "Ailserts" as the running surface of the stone. [12] Due to its status as a wildlife reserve by the Royal Society for the Protection of Birds, blasting and quarrying at Ailsa Craig is restricted. In 2002, Kays of Scotland was permitted to collect 1,500 tons of granite already displaced on the island.
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Greenschist is defined by the presence of the minerals chlorite, epidote, or actinolite, which give the rock its green color. Greenschists also have pronounced schistosity . [ 3 ] Schistosity is a thin layering of the rock produced by metamorphism (a foliation ) that permits the rock to easily be split into flakes or slabs less than 5 to 10 ...
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