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  2. Llanite - Wikipedia

    en.wikipedia.org/wiki/Llanite

    The geology of northeast Africa is very similar to that of Texas, and many of the two regions' minerals and fossils are only found in these two locations. [2] A dike of llanite crops out on Texas State Highway 16 about nine miles north of the town of Llano. [3]

  3. Mineral collecting - Wikipedia

    en.wikipedia.org/wiki/Mineral_collecting

    Mineral collectors find a variety of reasons to collect minerals. Many minerals are strikingly beautiful and collected for their aesthetic value. Others collect to learn more about mineralogy, the local mining industry and/or local geology. Some simply enjoy exploring the outdoors and socializing and trading with other mineral collectors.

  4. 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 ...

  5. Novaculite - Wikipedia

    en.wikipedia.org/wiki/Novaculite

    Novaculite forms light grey flatirons in the Marathon Uplift area of Texas. [1] Novaculite, also called Arkansas Stone, is a microcrystalline to cryptocrystalline rock type that consists of silica in the form of chert or flint. It is commonly white to grey or black in color, with a specific gravity that ranges from 2.2 to 2.5.

  6. Del Rio Clay - Wikipedia

    en.wikipedia.org/wiki/Del_Rio_Clay

    Del Rio Clay stratigraphic column in Texas. The Del Rio Clay is a geologic formation in Texas.It preserves fossils dating back to the Cretaceous period.. A stratigraphic column at the Mount Bonnell location starts with the Lower Cretaceous Trinity Group overlain by the Edwards Group and the Georgetown Formation.

  7. Amateur geology - Wikipedia

    en.wikipedia.org/wiki/Amateur_geology

    Avid rock collectors often use their specimens to learn about gemstones, petrology, mineralogy and geology as well as skills in the identification and classifying of specimen rocks, and preparing them for display. The hobby can lead naturally into lapidary projects, and also the cutting, polishing, and mounting of gemstones and minerals. The ...

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