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2. Sioux Quartzite - Wikipedia

   en.wikipedia.org/wiki/Sioux_quartzite

   Sioux Quartzite at Falls Park, Sioux Falls, South Dakota Cross-bedding in the Sioux Quartzite, Blue Mounds State Park, Minnesota, United States.. The Sioux Quartzite is a Proterozoic quartzite that is found in the region around the intersection of Minnesota, South Dakota, and Iowa, and correlates with other rock units throughout the upper midwestern and southwestern United States.

3. Quartzite - Wikipedia

   en.wikipedia.org/wiki/Quartzite

   Quartzite is a very hard rock composed predominantly of an interlocking mosaic of quartz crystals. The grainy, sandpaper-like surface is glassy in appearance. Minor amounts of former cementing materials, iron oxide, silica, carbonate and clay, often migrate during recrystallization, causing streaks and lenses to form within the quartzite. [1 ...

4. Gruen Watch Co. - Wikipedia

   en.wikipedia.org/wiki/Gruen_Watch_Co.

   D. Gruen, Sons & Co. Gruen watch ad from 1917. In 1900 the corporate name became D. Gruen, Sons & Co. The new company became partially a Swiss company. The movements were no longer made in Glashütte, Germany, but in Switzerland again. 1903, a subsidiary was formed, “The Gruen Watch Manufacturing Company”, located in Biel/Bienne, Switzerland.

5. Eureka Quartzite - Wikipedia

   en.wikipedia.org/wiki/Eureka_Quartzite

   The Eureka Quartzite is an extensive Paleozoic marine sandstone deposit in western North America that is notable for its great extent, extreme purity, consistently fine grain size of Quartzite, and its tendency to form conspicuous white cliffs visible from afar. The Eureka is commonly underlain and overlain by contrasting slope-forming ...

6. Van Hise Rock - Wikipedia

   en.wikipedia.org/wiki/Van_Hise_Rock

   Van Hise Rock is a rock monolith located along Wisconsin Highway 136 near Rock Springs, Wisconsin. The rock is a geologically significant outcropping of Baraboo Quartzite. It serves as a monument to Charles Van Hise, a prominent Wisconsin geologist who studied the area extensively. [3] The rock was declared a National Historic Landmark in 1997 ...

7. Engineered stone - Wikipedia

   en.wikipedia.org/wiki/Engineered_stone

   Engineered stone. Engineered stone is a composite material made of crushed stone bound together by an adhesive to create a solid surface. The adhesive is most commonly polymer resin, with some newer versions using cement mix. This category includes engineered quartz (SiO 2), polymer concrete and engineered marble stone. [1]