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  2. 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 ...

  3. Gemological Institute of America - Wikipedia

    en.wikipedia.org/wiki/Gemological_Institute_of...

    The Gemological Institute of America ( GIA) is a nonprofit institute based in Carlsbad, California. It is dedicated to research and education in the field of gemology and the jewelry arts. [ 1] Founded in 1931, GIA's mission is to protect buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality.

  4. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including ( clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. 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 ...

  5. New York–Pennsylvania border - Wikipedia

    en.wikipedia.org/wiki/New_YorkPennsylvania_border

    The New YorkPennsylvania border is the state line between the U.S. states of New York and Pennsylvania. It has three sections: Along the center line of the Delaware River from the Tri-States Monument tripoint with New Jersey at the confluence of the Delaware with the Neversink River in Port Jervis, New York to the 42nd parallel north between ...

  6. Border disputes between New York and Connecticut - Wikipedia

    en.wikipedia.org/wiki/Border_disputes_between...

    In 1650, the Treaty of Hartford sought to set the border between New Netherlands and the colonies of Connecticut. The main land was split by a line 50 miles from the Connecticut River and Long Island was divided into an East (Connecticut) and West ( New Netherland) at Oyster Bay. However, the treaty was never ratified back in England, which ...

  7. List of Canada–United States border crossings - Wikipedia

    en.wikipedia.org/wiki/List_of_Canada–United...

    Monument Road. The US purchased 12,580 square feet of land on the south side of Monument Road on May 25, 1932, and spent $5,625 to erect a red brick border station, which saw little traffic. This crossing was about 2000 feet north of Monument #1, which marks the beginning of the land border between the US and Canada.

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