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  2. Psilomelane - Wikipedia

    en.wikipedia.org/wiki/Psilomelane

    Psilomelane is a group name for hard black manganese oxides including hollandite and romanechite. Psilomelane consists of hydrous manganese oxide with variable amounts of barium and potassium. Psilomelane is erroneously, and uncommonly, known as black hematite, despite not being related to true hematite, which is an iron oxide.

  3. Storm drain - Wikipedia

    en.wikipedia.org/wiki/Storm_drain

    Storm drain grate on a street in Warsaw, Poland Storm drain with its pipe visible beneath it due to construction work. A storm drain, storm sewer (United Kingdom, U.S. and Canada), highway drain, [1] surface water drain/sewer (United Kingdom), or stormwater drain (Australia and New Zealand) is infrastructure designed to drain excess rain and ground water from impervious surfaces such as paved ...

  4. Streak (mineralogy) - Wikipedia

    en.wikipedia.org/wiki/Streak_(mineralogy)

    Streak plates with pyrite (left) and rhodochrosite (right). The streak of a mineral is the color of the powder produced when it is dragged across an unweathered surface. Unlike the apparent color of a mineral, which for most minerals can vary considerably, the trail of finely ground powder generally has a more consistent characteristic color, and is thus an important diagnostic tool in mineral ...

  5. How to Clean Glasses to Get Rid of Smudges and Streaks - AOL

    www.aol.com/clean-glasses-rid-smudges-streaks...

    Instead, use horizontal and vertical strokes to ensure your glasses are streak-free. Method 2: Dish Soap If you don't have lens spray handy, you can easily clean your glasses and sunglasses with ...

  6. Diffraction spike - Wikipedia

    en.wikipedia.org/wiki/Diffraction_spike

    Streaks due to a dirty lens An improperly cleaned lens or cover glass, or one with a fingerprint may have parallel lines which diffract light similarly to support vanes. [ 10 ] They can be distinguished from spikes due to non-circular aperture as they form a prominent smear in a single direction, and from CCD bloom by their oblique angle.

  7. Dark slope streak - Wikipedia

    en.wikipedia.org/wiki/Dark_slope_streak

    They range from about 20 to 200 meters in width and are generally several hundred meters to over 1,000 meters long. Dark slope streaks exceeding 2 kilometers in length are uncommon; most terminate on slope and do not extend further out on to level terrain. [1] [2] [17] A streak commonly starts at a single point high on the slope

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