corundum
41Abrasive — An abrasive is a material, often a mineral, that is used to shape or finish a workpiece through rubbing which leads to part of the workpiece being worn away. While finishing a material often means polishing it to gain a smooth, reflective surface …
42Craigmont, Ontario — Craigmont with Mount Robillard in the background. Craigmont is a ghost town in the Canadian province of Ontario. It straddles the municipal boundary of Carlow/Mayo in Hastings County and Brudenell, Lyndoch and Raglan in Renfrew County. It was a… …
43emery — /em euh ree, em ree/, n. a granular mineral substance consisting typically of corundum mixed with magnetite or hematite, used powdered, crushed, or consolidated for grinding and polishing. [1475 85; < MF emeri, OF esmeril < VL *smericulum, equiv …
44Al2O3 — Sapphire Sap phire (? or ?; 277), n. [OE. saphir, F. saphir, L. sapphirus, Gr. ?, of Oriental origin; cf. Heb. sapp[=i]r.] 1. (Min.) Native alumina or aluminium sesquioxide, {Al2O3}; corundum; esp., the blue transparent variety of corundum,… …
45Asteriated sapphire — Sapphire Sap phire (? or ?; 277), n. [OE. saphir, F. saphir, L. sapphirus, Gr. ?, of Oriental origin; cf. Heb. sapp[=i]r.] 1. (Min.) Native alumina or aluminium sesquioxide, {Al2O3}; corundum; esp., the blue transparent variety of corundum,… …
46Sapphire — Sap phire (? or ?; 277), n. [OE. saphir, F. saphir, L. sapphirus, Gr. ?, of Oriental origin; cf. Heb. sapp[=i]r.] 1. (Min.) Native alumina or aluminium sesquioxide, {Al2O3}; corundum; esp., the blue transparent variety of corundum, highly prized… …
47Star sapphire — Sapphire Sap phire (? or ?; 277), n. [OE. saphir, F. saphir, L. sapphirus, Gr. ?, of Oriental origin; cf. Heb. sapp[=i]r.] 1. (Min.) Native alumina or aluminium sesquioxide, {Al2O3}; corundum; esp., the blue transparent variety of corundum,… …
48Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… …
49Two Harbors, Minnesota — Infobox Settlement official name = Two Harbors, Minnesota settlement type = City nickname = motto = imagesize = 250px image caption = Aerial view of Two Harbors image image mapsize = 250px map caption = Location of Two Harbors, Minnesota mapsize1 …
50Silicon carbide — Chembox new Name = Silicon carbide ImageFile = Silicon carbide 3D balls.png ImageSize = 140px ImageName = Ball and stick model of part of a crystal of SiC ImageFile1 = silicon carbide detail.jpg ImageSize1 = 140px OtherNames = Section1 = Chembox… …
