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  2. Enhydro agate - Wikipedia

    en.wikipedia.org/wiki/Enhydro_agate

    The agate has a hollow center, partially containing water. Enhydro agates can also contain debris or petroleum. Because the cavity is not full, the agate can produce sound from being shaken. Agates vary in size. The largest recorded agate was found in Fuxin City, China, with a diameter of 63 cm (24.8 in) and weighing 310 kg (683 lbs). [4]

  3. Agate - Wikipedia

    en.wikipedia.org/wiki/Agate

    Agate (/ ˈ æ ɡ ɪ t / AG-it) is a fibrous, banded variety of chalcedony. [1] Agate stones are characterized by alternating bands of different colored chalcedony and sometimes include macroscopic quartz. They are common in nature and can be found globally in a large number of different varieties.

  4. Muiraquitã - Wikipedia

    en.wikipedia.org/wiki/Muiraquitã

    The Muiraquitã, a carved green frog-shaped stone, was used as an amulet by the Tapajós women to prevent disease and avoid infertility. Their popularity spread around the Lower Amazon Basin and through to the Caribbean, where Muiraquitãs from the Amazon state in Brazil were found.

  5. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    The new type of tourmaline, which soon became known as paraiba tourmaline, came in blue and green. Brazilian paraiba tourmaline usually contains abundant inclusions. Much of the paraiba tourmaline from Brazil does not actually come from Paraíba, but the neighboring state of Rio Grande do Norte. Material from Rio Grande do Norte is often ...

  6. Geology of Brazil - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Brazil

    Formed between the Mesozoic and Cenozoic, Brazil has numerous offshore basins that contain oil, related to the rifting of the Atlantic Ocean. The Sergipe-Alagoas Basin is an example of Aptian age shale, conglomerate and sandstone deposited in the final phase of rifting, while the Miranga, Aracas, Dom Joao and Agua Grande fields reflect mid ...

  7. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Agate is a variety of chalcedony that is fibrous and distinctly banded with either concentric or horizontal bands. [34] While most agates are translucent, onyx is a variety of agate that is more opaque, featuring monochromatic bands that are typically black and white. [35] Carnelian or sard is a red-orange, translucent variety of chalcedony.

  8. The symbolism and meaning behind different engagement ring shapes

    www.aol.com/symbolism-meaning-behind-different...

    Every engagement ring tells a story that starts with the center diamond. Each diamond shape has its own meaning and unique beauty, just like each relationship. When choosing an engagement ring ...

  9. Chrysoberyl - Wikipedia

    en.wikipedia.org/wiki/Chrysoberyl

    When found in such placers, it will have rounded edges instead of sharp, wedge-shape forms. Much of the chrysoberyl mined in Brazil and Sri Lanka is recovered from placers, as the host rocks have been intensely weathered and eroded. If the pegmatite fluid is rich in beryllium, crystals of beryl or chrysoberyl could form.

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