Occurs in pegmatites and high-temperature quartz veins, also in cavities in granites and rhyolites. A maximum of ~30 % of the F site is occupied by OH in natural topaz, although in some very rare cases OH-dominant members have been described in high-pressure rocks, see
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This page contains a numerical NAICS code list 2017. Users can view and lookup an index of 2017 NAICS codes in numerical order.
Named "corinvindum" in 1725 by John Woodward and derived from the Sanskrit, kuruvinda ("Ruby"). Richard Kirwan used the current spelling "corundum" in 1794.
An ore deposit is an accumulation of ore. This is distinct from a mineral resource as defined by the mineral resource classification criteria.
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