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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. Petoskey stone - Wikipedia

    en.wikipedia.org/wiki/Petoskey_stone

    A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. [1] Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.

  4. List of quarries in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_quarries_in_the...

    According to Marble.com, in 2016 there were 276 quarries producing natural stone in 34 states, and states producing the most granite were Texas, Massachusetts, Indiana, Wisconsin, and Georgia. [1] The term "quarry" refers also to sites producing aggregate, molding sand, or other resources besides cut stone.

  5. Chlorastrolite - Wikipedia

    en.wikipedia.org/wiki/Chlorastrolite

    Chlorastrolite occurs as amygdaloid structures and fracture fillings in basalt, and when the water and wave action has worn away the basalt, they are found as beach pebbles and granules in loose sediments. It is found in the Keweenaw Peninsula of the Upper Peninsula of Michigan and Isle Royale in Lake Superior. Isle Royale is a National Park ...

  6. Lake Superior agate - Wikipedia

    en.wikipedia.org/wiki/Lake_Superior_agate

    Its wide distribution and iron-rich bands of color reflect the gemstone's geologic history in Minnesota, Wisconsin, Nebraska, Iowa, Kansas, and Michigan. In 1969 the Lake Superior agate was designated by the Minnesota Legislature as the official state gemstone. The Lake Superior agate was selected because the agate reflects many aspects of ...

  7. List of sandstones - Wikipedia

    en.wikipedia.org/wiki/List_of_sandstones

    Monument Valley: Utah-Arizona state line; Navajo Sandstone: in the Colorado Plateau; Ohio Sandstone: Berea Grit in Northeast Ohio, originally used for grindstones, later used to build the Federal Reserve Bank of New York [6] [7] Ohio bluestone, also found in Northeast Ohio in certain streambeds [8] [9] and used as dimension stone

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. List of types of limestone - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_limestone

    Michigan limestone; Onondaga Limestone – Hard limestones rock formation in North America; St. Genevieve marble – Marble found in Missouri (not a "true marble"; oolitic limestone) St. Louis Limestone – Mississippian period geologic formation in the Midwest United States

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