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  2. Granite - Wikipedia

    en.wikipedia.org/wiki/Granite

    Granite (/ ˈ ɡ r æ n ɪ t / GRAN-it) is a coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous ...

  3. Pikes Peak granite - Wikipedia

    en.wikipedia.org/wiki/Pikes_Peak_granite

    Pikes Peak granite is a 1.08 billion year old Late-Precambrian geologic formation found in the central part of the Front Range of Colorado. It is a coarse-grained pink to light red syenogranite with minor gray monzogranite , and it has a distinctive brick-red appearance where it outcrops.

  4. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Monzogranite – Biotite granite rocks that are considered to be the final fractionation product of magma – A silica-undersaturated granite with <5% normative quartz; Monzonite – Igneous intrusive rock with low quartz and equal plagioclase and alkali feldspar – a plutonic rock with <5% normative quartz

  5. Jodhpur Group – Malani Igneous Suite Contact - Wikipedia

    en.wikipedia.org/wiki/Jodhpur_Group_–_Malani...

    This name underwent several changes over the years, known as Malani Volcanics Series (1902), Malani System (1933), the Malani Granite and Volcanic Suite(1968). Finally, the complete magmatic sequence has been named as the Malani Igneous Suite. [3] The igneous suite marks the last phase of igneous activity of Precambrian age in the Indian ...

  6. Igneous rock - Wikipedia

    en.wikipedia.org/wiki/Igneous_rock

    Close-up of granite (an intrusive igneous rock) Igneous rocks are classified according to mode of occurrence, texture, mineralogy, chemical composition, and the geometry of the igneous body. The classification of the many types of igneous rocks can provide important information about the conditions under which they formed.

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  8. 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.

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