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2. Quartz Vs. Granite: Which Stone Is Right For Your Countertops?

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

   Whereas quartz countertops are man-made, granite is a naturally occurring stone, quarried from the earth, then cut and polished into the countertop material so many know and love. Made of stern ...

3. 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 ...

4. Stephanite - Wikipedia

   en.wikipedia.org/wiki/Stephanite

   Anisotropic in polished section. Pleochroism. Very weak – white to pale pink. References. [2][3][4] Stephanite is a silver antimony sulfosalt mineral with formula: Ag 5 Sb S 4. It is composed of 68.8% silver, and sometimes is of importance as an ore of this metal. [5]

5. Chert - Wikipedia

   en.wikipedia.org/wiki/Chert

   Chert varies greatly in color, from white to black, but is most often found as gray, brown, grayish brown and light green to rusty red [9] [10] and occasionally as dark green. [11] Its color is an expression of trace elements present in the rock. Both red and green are most often related to traces of iron in its oxidized and reduced forms ...

6. Iceland spar - Wikipedia

   en.wikipedia.org/wiki/Iceland_spar

   Iceland spar is a colourless, transparent variety of calcium carbonate (CaCO 3). [3] It crystallizes in the trigonal system, typically forming rhombohedral crystals. [4] It has a Mohs hardness of 3 and exhibits double refraction, splitting a ray of light into two rays that travel at different speeds and directions. [3][5]

7. Diorite - Wikipedia

   en.wikipedia.org/wiki/Diorite

   Mineral assemblage of igneous rocks. Diorite (/ ˈdaɪ.əraɪt / DY-ə-ryte) [1][2] is an intrusive igneous rock formed by the slow cooling underground of magma (molten rock) that has a moderate content of silica and a relatively low content of alkali metals. It is intermediate in composition between low-silica (mafic) gabbro and high-silica ...