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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]
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 ...
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.
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 ...
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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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.
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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