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A limestone is a hard sedimentary rock , composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement.

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A Marble rock is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite.

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http://www.tngun.com/identifying-limestone/ ‎ http://www.amazon.com/Kingfisher-Field-Guide-Minerals-guides/dp/086272693X/Sheschinc-20 I needed some limestone to work some cement experiments trying to replicate both the Portland cement patent, and to make slaked lime for mortar mix. This meant I had to be able to identify limestone. Luckily since limestone is calcium carbonate, ( a base).

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http://www.tngun.com/identifying-limestone/ ‎ http://www.amazon.com/Kingfisher-Field-Guide-Minerals-guides/dp/086272693X/Sheschinc-20 I needed some limestone to work some cement experiments trying to replicate both the Portland cement patent, and to make slaked lime for mortar mix. This meant I had to be able to identify limestone. Luckily since limestone is calcium carbonate, ( a base).

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A pumice is a very light and porous volcanic rock formed when a gas-rich froth of glossy lava solidifies rapidly.

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This is obsidian in real life.In minecraft it looks very very different.Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth.Specific gravity‎: ‎c. 2.4Mohs scale hardness‎: ‎5–6Category‎: ‎Volcanic glass Other characteristics‎: ‎Texture: Smooth; glassy‎Obsidian (disambiguation) · ‎Obsidian use in Mesoamerica · ‎Apache tears · ‎Felsic

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A granite is a  very  hard, granular, crystalline, igneous rock consisting mainly of quartz, mica, and feldspar and often used as a building stone.

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don't know what a limestone is

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A felsite is a very fine-grained volcanic that may or may not contain larger crystals.

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A speckled, coarse-grained igneous rock consisting essentially of plagioclase, feldspar, and hornblende or other mafic minerals.

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A sand stone is a sedimentary rock consisting of sand or quartz grains cemented together, typically red, yellow, or brown in color.

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A Basalt is  dark, fine-grained volcanic rock that sometimes displays a columnar structure. It is typically composed largely of plagioclase with pyroxene and olivine.

a kind of black stoneware resembling basalt.

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A dolomite is a translucent mineral consisting of a carbonate of calcium and magnesium.

a sedimentary rock formed chiefly of dolomite.