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2. Spruce Pine Mining District - Wikipedia

   en.wikipedia.org/wiki/Spruce_Pine_Mining_District

   The Spruce Pine Mining District is a swath of the valley of the North Toe River in the Blue Ridge Mountains of northwestern North Carolina. The area is mined for its mica, kaolin, quartz and feldspar. [1] Spruce Pine district is one of the largest suppliers of high-purity quartz, which is used in the manufacture of silicon for integrated ...

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. Your Guide to the Real Cost of Granite Countertops - AOL

   www.aol.com/lifestyle/guide-real-cost-granite...

   It’s important to note for the average home renovation granite countertops will cost between $2,250 and $4,500, and most people are spending $3,250 for their countertops. In terms of square ...

5. Cheyenne Mountain Complex - Wikipedia

   en.wikipedia.org/wiki/Cheyenne_Mountain_Complex

   The Cheyenne Mountain Complex is a United States Space Force installation and defensive bunker located in unincorporated El Paso County, Colorado, next to the city of Colorado Springs, [2] at the Cheyenne Mountain Space Force Station, [a] which hosts the activities of several tenant units. Also located in Colorado Springs is Peterson Space ...

6. How Much Do Granite Countertops Cost? - AOL

   www.aol.com/lifestyle/much-granite-countertops...

   For premium support please call: 800-290-4726 more ways to reach us

7. Vinalhaven, Maine - Wikipedia

   en.wikipedia.org/wiki/Vinalhaven,_Maine

   Monolithic columns quarried for the Cathedral of St. John the Divine (installation completed in 1904). Fishing, shipbuilding, logging and shipping were important early businesses on Vinalhaven. High-quality granite was discovered in 1826, and Vinalhaven became one of Maine's largest quarrying centers for the next century. Today the island is ...

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9. Crystal oscillator - Wikipedia

   en.wikipedia.org/wiki/Crystal_oscillator

   A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric crystal as a frequency-selective element. [1] [2] [3] The oscillator frequency is often used to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers.