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  2. Rockdust - Wikipedia

    en.wikipedia.org/wiki/Rockdust

    Rock dust is a pulverized rock, usually limestone, sprayed on walls inside underground coal mines to prevent coal dust explosions. The dust acts as a heat sink, keeps coal dust levels down, and also prevents the incidence of black lung disease. Rock dust has been used since the early 1900s, but technological improvements have occurred. [1]

  3. Stolen and missing Moon rocks - Wikipedia

    en.wikipedia.org/wiki/Stolen_and_missing_moon_rocks

    While the Apollo 17 Goodwill Moon rock presented to Cyprus was recovered, the Apollo 11 rock given to the country remains missing. [8]In his June 26, 2011 Op/Ed appearing in the Cyprus Mail entitled "Houston we have a problem: we didn't give Cyprus its moon rock", Joseph Gutheinz revealed that after NASA recovered the Cyprus Apollo 17 Goodwill Moon Rock over a year ago they failed to give the ...

  4. Helenite - Wikipedia

    en.wikipedia.org/wiki/Helenite

    Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [1] [2] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980.

  5. Moon rock - Wikipedia

    en.wikipedia.org/wiki/Moon_rock

    Moon rock or lunar rock is rock originating ... returned approximately 1,731 g (61.1 oz) of rocks and dust from the Oceanus ... and went on sale for $2.5 ...

  6. Rock flour - Wikipedia

    en.wikipedia.org/wiki/Rock_flour

    Rock flour, artificial or natural, is a source of plant micronutrients (minerals trace elements) widely used in organic farming practices as a soil conditioner.Synonyms in this case include rock dust, rock powders, rock minerals, and mineral fines.

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  8. Coal dust - Wikipedia

    en.wikipedia.org/wiki/Coal_dust

    Rock dusting has been used since the early 1900s, but there have been technological improvements since then. [8] Since then, NIOSH developed a Coal Dust Explosibility Meter (CDEM) to test the mixture between coal and rock dust in mines. [9] This field testing process allows miners to gauge the explosibility of their work environment.

  9. 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 ...

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