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  2. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...

  3. Portal:Minerals - Wikipedia

    en.wikipedia.org/wiki/Portal:Minerals

    The mineral resembles quartz in symmetry and it exhibits birefringence. Cinnabar has a mean refractive index near 3.2, a hardness between 2.0 and 2.5, and a specific gravity of approximately 8.1. The color and properties derive from a structure that is a hexagonal crystalline lattice belonging to the trigonal crystal system , crystals that ...

  4. Silicate mineral - Wikipedia

    en.wikipedia.org/wiki/Silicate_mineral

    Lithium aluminium silicate mineral spodumene. Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of minerals and make up approximately 90 percent of Earth's crust. [1] [2] [3] In mineralogy, silica (silicon dioxide, SiO 2) is usually considered a silicate mineral rather than an ...

  5. Phantom quartz - Wikipedia

    en.wikipedia.org/wiki/Phantom_quartz

    Phantom quartz is a variety of quartz consisting of visible layers of overlapping crystal growths. The outline of the inner crystals can be seen due to some variation in composition or mineral inclusion making the boundary between growths visible. [1] The interior crystal layers are known as phantoms. Phantoms can be found in many varieties of ...

  6. What's the Difference Between Quartz and Quartzite? - AOL

    www.aol.com/whats-difference-between-quartz...

    Learn about quartz vs. quartzite countertops pros and cons from experts, including differences in cost, care, and design possibilities.

  7. Mineral - Wikipedia

    en.wikipedia.org/wiki/Mineral

    For example, amethyst is a purple variety of the mineral species quartz. Some mineral species can have variable proportions of two or more chemical elements that occupy equivalent positions in the mineral's structure; for example, the formula of mackinawite is given as (Fe,Ni) 9 S 8, meaning Fe x Ni 9-x S 8, where x is a variable number between ...

  8. Quartzolite - Wikipedia

    en.wikipedia.org/wiki/Quartzolite

    Quartzolite or silexite is an intrusive igneous rock, in which the mineral quartz is more than 90% of the rock's felsic mineral content, with feldspar at up to 10%. [ 1 ] : 135 [ 2 ] Typically, quartz forms more than 60% of the rock, [ 3 ] the rest being mostly feldspar although minor amounts of mica or amphibole may also be present. [ 2 ]

  9. Category:Quartz varieties - Wikipedia

    en.wikipedia.org/wiki/Category:Quartz_varieties

    Varieties of the mineral Quartz. Subcategories. This category has the following 2 subcategories, out of 2 total. C. Chert‎ (3 C, 23 P) Q. Quartz gemstones‎ (2 C ...