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emery rock wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 description 2 use 3 harvest 4 safety 5 see also 6 references 7 further reading 8 external links toggle the table of contents emery rock 30 languages العربية asturianu български català нохчийн کوردی čeština dansk deutsch ελληνικά esperanto español euskara فارسی français frysk gaeilge हिन्दी hrvatski magyar ido nederlands norsk nynorsk norsk bokmål polski português русский svenska українська oʻzbekcha ўзбекча edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia redirected from emery mineral metamorphic rock emery mine on naxos island corundite from the naxos emery deposits the corundum is blue or sapphire wet slab 10 cm 3 9 in wide 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 the main suppliers of the world s emery description edit emery is a granular rock used to make an abrasive powder it largely consists of corundum aluminium oxide mixed with other minerals such as the iron bearing spinels hercynite and magnetite and also rutile titania industrial emery may contain a variety of other minerals and synthetic compounds such as magnesia mullite and silica emery is black or dark grey in colour less dense than translucent brown corundum with a specific gravity of between 3 5 and 3 8 because it can be a mixture of minerals no definite mohs hardness can be assigned the hardness of corundum is 9 and that of some spinel group minerals is near 8 but the hardness of others such as magnetite is near 6 use edit crushed or naturally eroded emery known as black sand is used as an abrasive for example on emery boards and emery cloth it is also used as a traction enhancer in asphalt and tarmac mixtures a small quantity of emery is used in coated abrasive products but its main use in the united states is wear resistant floors and pavements 1 many tons are shipped to asia to be used in grinding rice 2 solomon s shamir a substance used to cut stone during construction of the first temple was likely emery 3 harvest edit turkey and greece are the main suppliers of the world s emery these two countries produced about 17 500 tons of the mineral in 1987 4 in 2010 turkey s emery production was 6 000 tonnes while greece s was 2 000 tonnes according to data from the u s geological survey usgs the greek island of naxos used to be the main source of this industrially important rock type it has been mined on the eastern side of naxos for well over two thousand years as mentioned by pliny the elder s the natural history book xxxvii chp 32 however demand for emery has decreased with the development of sintered carbide and oxide materials as abrasives safety edit in the united states the occupational safety and health administration has set permissible exposure limits for emery in the workplace twa 15 mg m 3 total exposure and twa 5 mg m 3 respiratory exposure 5 see also edit emery paper emery tales references edit jacqueline kroschwitz 2004 kirk othmer encyclopedia of chemical technology 5th ed hoboken nj wiley interscience p 10 isbn 9780471484943 p harbin november 1978 industrial minerals metal bulletin 49 73 cite journal missing or empty title help shamir shumar and emery balashon hebrew language detective retrieved 13 december 2023 g t austin 1987 minerals yearbook volume 1 pp 71 84 niosh pocket guide to chemical hazards 0250 national institute for occupational safety and health niosh further reading edit oberg erik jones franklin d horton holbrook l ryffel henry h 2000 machinery s handbook 26th ed new york industrial press inc isbn 0 8311 2635 3 external links edit wikisource has the text of the 1879 american cyclopædia article emery wikimedia commons has media related to emery rock cdc niosh pocket guide to chemical hazards emery mining in waldthurn de retrieved from https en wikipedia org w index php title emery_ rock oldid 1364268044 categories aluminium minerals abrasives corundum varieties oxide minerals iron minerals hidden categories articles with short description short description matches wikidata cs1 errors missing title commons category link is on wikidata this page was last edited on 15 july 2026 at 15 21 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents emery rock 30 languages add topic