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  2. Ohio Caverns - Wikipedia

    en.wikipedia.org/wiki/Ohio_Caverns

    Ohio Caverns is a show cave located 30 miles (48 km) from Dayton, Ohio near West Liberty, in Salem Township, Champaign County, Ohio in the United States.A popular tourist destination and member of the National Caving Association, it is the largest of all the cave systems in Ohio and contains many crystal formations.

  3. Porphyritic - Wikipedia

    en.wikipedia.org/wiki/Porphyritic

    The large grain in the middle is of a much different size class than the small needle-like crystals around it. Scale box in millimeters. Porphyritic is an adjective used in geology to describe igneous rocks with a distinct difference in the size of mineral crystals, with the larger crystals known as phenocrysts.

  4. Geology of Ohio - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Ohio

    The overlying Devonian rocks include the Columbus Limestone to the east of the Findlay Arch and the Detroit River Group carbonates to the west. The angular unconformity between lower Silurian rocks is marked in some places by phosphate beds, that preserve bones and teeth. A cast of a Dunkleosteus fossil found near Cleveland, Ohio

  5. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    Large crystals are favored. In normal igneous rocks, coarse texture is a result of slow cooling deep underground. [14] It is not clear if pegmatite forms by slow or rapid cooling. [15] In some studies, crystals in pegmatitic conditions have been recorded to grow at a rate ranging from 1 m to 10 m per day. [16]

  6. 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 ...

  7. Crystal Cave (Ohio) - Wikipedia

    en.wikipedia.org/wiki/Crystal_Cave_(Ohio)

    The Crystal Cave is a limestone cave located in Put-in-Bay, Ohio, located on South Bass Island in Lake Erie. [1] In 1887, Gustav Heineman emigrated from Baden-Baden, Germany, to Put-in-Bay, Ohio, where he established a winery. In 1897 he dug a well beneath his winery and discovered a large vug at a depth of 30 feet (9.1 m).

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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. Porphyry (geology) - Wikipedia

    en.wikipedia.org/wiki/Porphyry_(geology)

    "Imperial Porphyry" from the Red Sea Mountains of Egypt A waterworn cobble of porphyry Rhyolite porphyry from Colorado; scale bar in lower left is 1 cm (0.39 in). Porphyry (/ ˈ p ɔːr f ə r i / POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass.

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