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2. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to ...

3. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...

4. How to Spot The Best Vintage Jewelry in Thrift Stores ... - AOL

   www.aol.com/spot-best-vintage-jewelry-thrift...

   “Fake pearls or stones can also give themselves away if they look overly uniform, plastic-y, or scratched up.” Montalvo also tests clasps and hinges. If they feel loose or cheap, the piece ...

5. Rubble trench foundation - Wikipedia

   en.wikipedia.org/wiki/Rubble_trench_foundation

   A cross section view of a rubble trench foundation A rubble trench foundation. The rubble trench foundation, an ancient construction approach popularized by architect Frank Lloyd Wright, is a type of foundation that uses loose stone or rubble to minimize the use of concrete and improve drainage. [1]

6. Chrysanthemum stone - Wikipedia

   en.wikipedia.org/wiki/Chrysanthemum_stone

   The intact chrysanthemum stone from the naturally exposed environment has become extinct, but in general, it is fragile and easily damaged after being changed by chemical methods. Using the method of a few chemistry or physics to pledge the stone material with loose material consolidates will only strengthen the surface.

7. Hiddenite - Wikipedia

   en.wikipedia.org/wiki/Hiddenite

   Hiddenite is a pale-to-emerald green variety of spodumene that is sometimes used as a gemstone. The first specimens of the hiddenite variety of spodumene were recovered circa 1879 near the settlement of White Plains, west of Stony Point, Alexander County, North Carolina. According to contemporary accounts, a man named Lackey brought them to the ...