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Transcript of Minerals
Limestone is a very common sedimentary rock of biochemical origin. It is composed mostly of the mineral calcite. Sometimes it is almost pure calcite, but most limestones are filled with lots of other minerals and sand and they are called dirty limestones. The calcite is derived mostly from the remains of organisms such as clams, brachiopods, bryozoa, crinoids and corals. These animals live on the bottom of the sea and when they die their shells accumulate into piles of shelly debris.
Chalk is a sedimentary rock of biochemical origin. It is soft, white and porous. It formed in the deep ocean far from land via the gradual accumulation of the calcite shells of coccolithophores. Layers of chalk are known that are hundreds of feet thick, indicating extremely long periods of accumulation. END Added part Texture mineral composition ....observing shape and size of crystals in a rock and finding minerals it has origin whether it's igneous, or sedimentary or metapmorphic rock how to be a mineral naturally occuring, inorganic, solid, crystal structure,Chemical composition Seven tests to identify minerals hardness, color, streak, crystal system, luster, density, special properties 2 examples on how minerals form When magma cools inside crust when the liquid cools they form crystal, and if the crystal is undisturbed while cooling it grows by adding atoms in the right pattern. When halites are disolved in water and evaporate... Ore Rock that contains metal or economically intrusive and extrusive rocks Intrusive igneous rocks are formed from magma that cools and solidifies within the crust of a planet. Extrusive igneous rocks are formed at the crust's surface as a result of the partial melting of rocks within the mantle and crust. Clastic, organic, chemical sedimentary rocks Clastic sedimentary rocks are composed of discrete fragments or clasts of materials derived from other minerals Organic sedimentary rocks contain materials generated by living organisms Chemical sedimentary rocks form when minerals in solution become supersaturated and precipitate.