Description of Geology Rocks Rhyolite Chemical Composition: Silica/Silicon oxide (65-70%) Mineralogical Composition: Quartz plagioclase sanidine hornblende and biotite. Textural Composition: Its texture is fine and porphyritic (the crystal are well-formed and are set in a glassy or fine-grained matrix). Origin: Rhyolite mainly forms from partially cooled granitic magma that gets to the surface either continental-margin or continental volcanic eruptions. Rhyolite Image Image Source: geology.com Basalt Chemical Composition: 45-52% that is primarily formed when limestone is subjected to pressure and heat of metamorphism. Marble Image Image Source: geology.com Slate Chemical Composition: Silica Mineral Composition: Micas quartz or clay minerals and abundant calcite pyrite feldspar and hematite. Texture: Fine-grained rock with a fine texture. Origin: Slate is a foliated metamorphic rock that originates from the alteration of shale or mudstone by low-grade regional metamorphism. Slate Image Image source: http://geology.com/rocks/slate.shtml [...]
Complete description (including chemical, mineralogical and textural composition) AND origin of rocks from the following list: Rhyolite, Basalt, Conglomerate, Coquina, Marble, Slate.