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  2. Color index (geology) - Wikipedia

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

    Speaking broadly, mineral color points out the specific gravity of the mineral, as minerals that are lighter in color tend to be less dense. Darker minerals typically tend to contain more of relatively heavy elements, notably iron, magnesium, and calcium. [2] The temperature of crystallization affects what the color index of rocks tends to be. [10]

  3. Inclusion (mineral) - Wikipedia

    en.wikipedia.org/wiki/Inclusion_(mineral)

    In mineralogy, an inclusion is any material trapped inside a mineral during its formation. In gemology , it is an object enclosed within a gemstone or reaching its surface from the interior. [ 1 ] According to James Hutton 's law of inclusions, fragments included in a host rock are older than the host rock itself.

  4. Peridot - Wikipedia

    en.wikipedia.org/wiki/Peridot

    The most common mineral inclusion in peridot is the chromium-rich mineral chromite. Magnesium-rich minerals also can exist in the form of pyrope and magnesiochromite. These two types of mineral inclusions are typically surrounded "lily-pad" cleavages. Biotite flakes appear flat, brown, translucent, and tabular. [16]

  5. Mica - Wikipedia

    en.wikipedia.org/wiki/Mica

    Dark mica from eastern Ontario. Micas (/ ˈ m aɪ k ə z / MY-kəz) are a group of silicate minerals whose outstanding physical characteristic is that individual mica crystals can easily be split into fragile elastic plates. This characteristic is described as perfect basal cleavage.

  6. Fluid inclusion - Wikipedia

    en.wikipedia.org/wiki/Fluid_inclusion

    Hydrothermal ore minerals, which typically form from high temperature aqueous solutions, trap tiny bubbles of liquids or gases when cooling and forming solid rock. The trapped fluid in an inclusion preserves a record of the composition, temperature and pressure of the mineralizing environment. [1] An inclusion often contains two or more phases ...

  7. US farm groups want Trump to spare their workers from ... - AOL

    www.aol.com/news/us-farm-groups-want-trump...

    By Leah Douglas and Ted Hesson. WASHINGTON (Reuters) - U.S. farm industry groups want President-elect Donald Trump to spare their sector from his promise of mass deportations, which could upend a ...

  8. Ultramafic rock - Wikipedia

    en.wikipedia.org/wiki/Ultramafic_rock

    Peridotite, a type of ultramafic rock. Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are usually composed of greater than 90% mafic minerals (dark colored, high magnesium and iron content).

  9. Roku Sets Streaming Deal With X Games for Aspen Return ... - AOL

    www.aol.com/roku-sets-streaming-deal-x-130000610...

    Roku has struck a deal with the X Games for its Roku Channel to become the U.S. streaming home of both the upcoming Winter 2025 competition in Aspen as well as an event set for next summer. The X ...

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