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Bianca Foster

on 18 December 2013

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Transcript of Quartz

Quartz is an rock forming mineral. It is colorless and it is a silicate. Quartz is the second most abundant mineral found in the Earth's crust. The formula for Quartz is SiO2. Hardness:7, Luster:vitreous, Streak:white, and Breakage: conchoidal fracture. Quartz's crystal shape is hexagonal. Quartz is mined in Arkansas and Brazil. Quartz is used in radios, as crystal gems, sandpaper, soap, prisms, glass, paints, clocks, watches, and computers. Quartz can form various gems and there are a variety of quartz.
A diamond is a precious stone that is colorless and is composed of pure carbon. A diamond also is an ore forming mineral. Luster:vitreous, Breakage:cleaves on 4 planes, Hardness:10, Streak:white. Diamond is octahedral and the chemical formula is C. Diamond is used to cut tools and precision instruments diamond is also used for jewelry. Diamond is a semiconductor but does not conduct heat well. Diamond is mined in Murfreesboro, Arkansas, South Carolina, Congo, and Tanzania.
Magnetite is a gray-black magnetic mineral that consists of an oxide of iron and is an important form of iron ore. Magnetite has a metallic luster and it is opaque. Magnetite has conchoidal fracture. Magnetite has a hardness of 5.5-6.5 and a streak of black. Magnetite is isometric and it's chemical formula is Fe3O4. Magnetite is mined in Australia. Magnetite is used as a pigment in paints, in magnets, in concrete, to make iron and steel, and magnetite is used for fertilizers. Magnetite is naturally magnetic.
Calcite is a carbonate. Calcite is also a rock-forming mineral. Calcite comes in many colors. The chemical formula of calcite is CaCO3. On Moh's hardness scale calcite has a hardness of 3 and a streak of white with a glassy luster and a conchoidal fracture. Calcite is in the crystal system of trigonal. Calcite is mined in Missouri and is mainly used for the construction industry but is also used as a whitener, glass, and statues. When calcite is mixed with water it becomes limestone.
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