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  2. Tumble finishing - Wikipedia

    en.wikipedia.org/wiki/Tumble_finishing

    A collection of gemstone pebbles. Most of these stones, except four rough ones, were tumbled and polished. Tumbling of rocks as a lapidary technique for rock polishing usually requires a plastic or rubber-lined barrel loaded with a consignment of rocks, all of similar or the same hardness, some abrasive grit, and a liquid lubricant.

  3. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    A collection of gemstone pebbles made by tumbling the rough stones, except the ruby and tourmaline, with abrasive grit inside a rotating barrel. The largest pebble here is 40 mm (1.6 in) long.

  4. Emery (rock) - Wikipedia

    en.wikipedia.org/wiki/Emery_(rock)

    Emery, or corundite, is a dark granular rock used to make an abrasive powder. The rock largely consists of corundum (aluminium oxide), mixed with other minerals. Industrial emery may contain a variety of other minerals and synthetic compounds. Crushed or naturally eroded emery (known as black sand) is used as an abrasive. Turkey and Greece are ...

  5. The Kindness Rocks Project - Wikipedia

    en.wikipedia.org/wiki/The_Kindness_Rocks_Project

    The Kindness Rocks Project is a viral trend where people, commonly children, paint pebbles or cobbles and leave them for others to find and collect. Photos of the painted rocks and hints of where to find them are commonly shared on Facebook groups . [ 1 ]

  6. Indoor & Outdoor Winter Workout Ideas to Stay Active All ...

    www.aol.com/indoor-outdoor-winter-workout-ideas...

    Use exercise machines at the gym or at home. Exercise machines offer a convenient way to maintain cardio and strength workouts during the colder months. ... Look into rock-climbing gyms. Shake up ...

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    A pegmatite is an igneous rock showing a very coarse texture, with large interlocking crystals usually greater in size than 1 cm (0.4 in) and sometimes greater than 1 meter (3 ft). Most pegmatites are composed of quartz , feldspar , and mica , having a similar silicic composition to granite .

  9. Chert - Wikipedia

    en.wikipedia.org/wiki/Chert

    Chert (/ tʃ ɜːr t /) is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, [1] the mineral form of silicon dioxide (SiO 2). [2] Chert is characteristically of biological origin, but may also occur inorganically as a chemical precipitate or a diagenetic replacement, as in petrified wood.

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