When.com Web Search

Search results

  1. Results From The WOW.Com Content Network
  2. Porphyry (geology) - Wikipedia

    en.wikipedia.org/wiki/Porphyry_(geology)

    "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.

  3. Porphyry (philosopher) - Wikipedia

    en.wikipedia.org/wiki/Porphyry_(philosopher)

    Porphyry of Tyre (/ ˈ p ɔːr f ɪr i /; Koinē Greek: Πορφύριος, romanized: Porphýrios; c. 234 – c. AD 305) was a Neoplatonic philosopher born in Tyre, Roman Phoenicia [1] during Roman rule.

  4. Porphyry - Wikipedia

    en.wikipedia.org/wiki/Porphyry

    Porphyry (geology), an igneous rock with large crystals in a fine-grained matrix, often purple, and prestigious Roman sculpture material; Shoksha porphyry, quartzite of purple color resembling true porphyry mined near the village of Shoksha, Karelia, Russia; Porphyritic, the general igneous texture of a rock with two distinct crystal ...

  5. Porphyrian tree - Wikipedia

    en.wikipedia.org/wiki/Porphyrian_tree

    Porphyrian trees by three authors: Purchotius (1730), Boethius (6th century), and Ramon Llull (ca. 1305). In philosophy (particularly the theory of categories), the Porphyrian tree or Tree of Porphyry is a classic device for illustrating a "scale of being" (Latin: scala praedicamentalis), attributed to the 3rd-century CE Greek neoplatonist philosopher and logician Porphyry, and revived through ...

  6. Porphyry copper deposit - Wikipedia

    en.wikipedia.org/wiki/Porphyry_copper_deposit

    Porphyry copper deposits represent an important resource and the dominant source of copper that is mined today to satisfy global demand. [6] Via compilation of geological data, it has been found that the majority of porphyry deposits are Phanerozoic in age and were emplaced at depths of approximately 1 to 6 kilometres with vertical thicknesses on average of 2 kilometres. [6]

  7. Porphyritic - Wikipedia

    en.wikipedia.org/wiki/Porphyritic

    Andesite porphyry from summit of O'Leary Peak. This is an extrusive porphyritic rock, as the pink (and black) phenocrysts are clearly visible, in contrast to the grey groundmass with its microscopic crystals.

  8. Mons Porphyrites - Wikipedia

    en.wikipedia.org/wiki/Mons_Porphyrites

    Imperial porphyry mined from Mons Porphyrites. The actual quarries were spread out over 9 square kilometres (3.5 sq mi). [5] There were five dispersed villages for workers and a central complex at Wadi Abu Ma'amel 630 metres (2,070 ft) above sea level. The highest quarries were at Rammius at 1,438 metres (4,718 ft).

  9. On Abstinence from Eating Animals - Wikipedia

    en.wikipedia.org/wiki/On_Abstinence_from_Eating...

    Depiction of Porphyry from the Tree of Jesse at the Sucevița Monastery, 1535. On Abstinence from Eating Animals [a] (Koinē Greek: Περὶ ἀποχῆς ἐμψύχων, romanized: Peri apochēs empsychōn, Latin: De abstinentia ab esu animalium) is a 3rd-century treatise by Porphyry on the ethics of vegetarianism.