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

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

   Quartzite’s patterns can look like stripes, swirls, or little brushes of mineral quartz, and they can appear more bold or light. Quartzite also comes in a variety of hues, from white, gray, and ...

4. Silicate mineral - Wikipedia

   en.wikipedia.org/wiki/Silicate_mineral

   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 oxide mineral. Silica is found in nature as the mineral quartz, and its polymorphs.

5. Quartzite - Wikipedia

   en.wikipedia.org/wiki/Quartzite

   Quartzite can have a grainy, glassy, sandpaper-like surface. Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. [1] [2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.

6. Quartz Vs. Granite: Which Stone Is Right For Your ... - AOL

   www.aol.com/quartz-vs-granite-stone-countertops...

   While “quartz” is a natural mineral, the type of quartz we talk about in reference to countertops is an engineered material. Quartz countertops are composed of crushed quartz crystals, resins ...

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 ...