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  2. Dendrite (crystal) - Wikipedia

    en.wikipedia.org/wiki/Dendrite_(crystal)

    The first dendritic patterns were discovered in palaeontology and are often mistaken for fossils because of their appearance. The first theory for the creation of these patterns was published by Nash and Glicksman in 1974, they used a very mathematical method and derived a non-linear integro-differential equation for a classical needle growth.

  3. Category:Archaeological sites in Ohio - Wikipedia

    en.wikipedia.org/wiki/Category:Archaeological...

    This is a listing of sites of archaeological interest in the state of Ohio, in the United States Wikimedia Commons has media related to Archaeological sites in Ohio . Subcategories

  4. Agate - Wikipedia

    en.wikipedia.org/wiki/Agate

    Lysite agate is a vein agate named after Lysite Mountain, Wyoming. It is frequently colorful and may contain moss and plumes in addition to bands. Nebraska blue agate is a sedimentary agate with dendritic patterns that formed during the Oligocene epoch. It can be found throughout northwestern Nebraska and southwestern South Dakota.

  5. Dendrite (metal) - Wikipedia

    en.wikipedia.org/wiki/Dendrite_(metal)

    Dendritic crystallization after melting inside sealed ampules of rubidium and caesium metal A dendrite in metallurgy is a characteristic tree-like structure of crystals growing as molten metal solidifies, the shape produced by faster growth along energetically favourable crystallographic directions.

  6. Lake Superior agate - Wikipedia

    en.wikipedia.org/wiki/Lake_Superior_agate

    Lake Superior Agate - Duluth, Minnesota. The Lake Superior agate is a type of agate stained by iron and found on the shores of Lake Superior.Its wide distribution and iron-rich bands of color reflect the gemstone's geologic history in Minnesota, Wisconsin, Nebraska, Iowa, Kansas, and Michigan.

  7. Concretion - Wikipedia

    en.wikipedia.org/wiki/Concretion

    This process results in roughly spherical concretions that grow with time. In the case of pervasive growth, cementation of the host sediments, by infilling of its pore space by precipitated minerals, occurs simultaneously throughout the volume of the area, which in time becomes a concretion. Concretions are often exposed at the surface by ...