This is a special rock. It has big crystals inside. It can be deep purple. Long ago, kings loved it. They used it for big buildings. Do you like purple rocks? 
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![File:"Imperial Porphyry" - porphyritic metadacite to porphyritic meta-andesite (Dokhan Volcanics, Neoproterozoic, ~593-602 Ma; Mons Porphyrites, Red Sea Mountains, Egypt) 2 (30040632451).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/ca/"Imperial_Porphyry"_-_porphyritic_metadacite_to_porphyritic_meta-andesite_(Dokhan_Volcanics,_Neoproterozoic,_~593-602_Ma;_Mons_Porphyrites,_Red_Sea_Mountains,_Egypt)_2_(30040632451).jpg/800px-"Imperial_Porphyry"_-_porphyritic_metadacite_to_porphyritic_meta-andesite_(Dokhan_Volcanics,_Neoproterozoic,_~593-602_Ma;_Mons_Porphyrites,_Red_Sea_Mountains,_Egypt)_2_(30040632451).jpg)
"Imperial Porphyry" - porphyritic...
Särna-Porphyr P1000115.JPG
Rhyolite porphyry.jpg
Igneous Porphyry from Death Valley...
Venice – The Tetrarchs 03.jpg
Carmagnola_1.jpg
Istanbul_-_Museo_archeologico_-_Sarcofago_...
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Content adapted from Wikipedia
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Readability: FK 14.2
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Vital Level 5