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-igneous rock has obsidian in the rock family as a natural glass formed by rapid cooling of volcanoes. Its extremely rich silica (65-80 percent chance to find)

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composed of large parts of particals of inferior quality or apperanece not fine in material or close in texture. Synoms gritty blunt,indelicate,obsence,uncouth,

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Granite is the oldest igneous rock in the world, believed to have been formed as long as 300 million years ago. Granite is also what's called a “plutonic” rock, meaning that it forms deep underground.

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Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite. Marble is typically not foliated, although there are exceptions. In geology, the term marble refers to metamorphosed limestone

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-  Sedimentary Rocks  are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth's surface. Sedimentary rocks often have distinctive layering or bedding.

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Sandstone is a clastic sedimentary rock composed mainly of sand-sized mineral particles or rock fragments or organic material. Most sandstone is composed of quartz or feldspar because they are the most resistant minerals to weathering processes at the Earth's surface, as seen in the Goldich dissolution series.

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Graphite is a gray crystalline allotropic form of carbon which occurs as a mineral in some rocks and can be made from COKE! And is most recognizably used for pencils. Another use is for nuclear reactors. Often mistaken for lead!

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Coal is a hard rock which can be burned as a solid fossil fuel. It is mostly carbon but also contains hydrogen, sulphur, oxygen and nitrogen. It is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top.