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12 September, 14:45

How would you distinguish between rhyolite porphyry, andesite porphyry, and basalt porphyry

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  1. 12 September, 16:29
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    Basalt

    Formation - basalt is (mineral) a hard igneous rock of varied mineral content formed when lava reaches the Earth's surface near an active volcano

    Texture - is fine grained so the individual minerals are not visible

    Colour - basalt being dark

    Rhyolite

    Formation - Rhyolite is a very fine-grained to glassy extrusive igneous rock. Formed in continental plates have volcanic eruptions.

    Texture - very small than grains and are difficult to observe without using a hand lens.

    Colour - light in colour whether pink or grey

    Andesite

    Formation - Andesite is a fine-grained igneous rock that forms when the magma is rises up onto the surface and crystallized quickly

    Texture - higher than basalt and lower than rhyolite

    Colour - - color is pale due to silica content
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