porcellanite
porcellanite A highly siliceous sedimentary rock with a dull lustre, porous texture, and conchoidal fracture, similar in general appearance to porcelain. These rocks are less hard and vitreous than cherts. Porcellanites include certain biogenic, siliceous, deep-sea sediments and some fine-grained, recrystallized, acid tuffs.
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Acid Rock , acid rock Basic Rock , basic rock Rock with a relatively high concentration of iron, magnesium, and calcium, and with 45–53% of silica by weight. Examples include gabbro, w… Rock , rock1 / räk/ • n. 1. the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underly… Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… Iron Ores , Rocks
Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m… Trachyte , trachyte Fine-grained volcanic rock of the alkaline series of intermediate rocks. Trachyte is the volcanic equivalent of syenite.
trachyte gritty vol…
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porcellanite