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  2. Crushed stone - Wikipedia

    en.wikipedia.org/wiki/Crushed_stone

    Crushed stone or angular rock is a form of construction aggregate, ... In landscaping as a ... The average unit price increased from US$1.58 per metric ton, f.o.b ...

  3. River gravel - Wikipedia

    en.wikipedia.org/wiki/River_gravel

    River gravel is a name given to gravel composed of small pieces of rounded stone of various colors, usually no larger than a large coin. [1] It is named for the effect of many years of rounding of the edges of the stones due to a flow of water over it, as often takes place in a river . [ 2 ]

  4. Phosphate mining in the United States - Wikipedia

    en.wikipedia.org/wiki/Phosphate_mining_in_the...

    The exact phosphate content of the phosphate rock mined in 2015 is not available, but in the latest five-year period for which ore grades are available, 2009-2013, the grade of US phosphate rock varied from 28.5 to 29.0 percent P 2 O 5. As of 2016, remaining reserves of phosphate rock in the United States totaled 1.1 billion metric tons. [1]

  5. Erratic Rock State Natural Site - Wikipedia

    en.wikipedia.org/wiki/Erratic_Rock_State_Natural...

    Erratic Rock State Natural Site is a state park in the Willamette Valley of Oregon, United States. Featuring a 40-short-ton (36 t) glacial erratic from the Missoula Floods , the small park sits atop a foothill of the Northern Oregon Coast Range in Yamhill County between Sheridan and McMinnville off Oregon Route 18 .

  6. Ontonagon Boulder - Wikipedia

    en.wikipedia.org/wiki/Ontonagon_Boulder

    Sign commemorating the Ontonagon Boulder Location of Ontonagon Boulder. The Ontonagon Boulder (/ˌɒntəˈnɑːɡən ˈboʊldəɹ/, Chippewa: Misko-biiwaabik) is a 3,708-pound (1,682 kg) boulder of native copper originally found in the Upper Peninsula of Michigan, United States, and now in the possession of the Department of Mineral Sciences, National Museum of Natural History, Smithsonian ...

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