5 Terms
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General mining
General mining related terms and definitions in minerals and related activities.
Industry: Mining
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General mining
Spessartine
Mining; General mining
A "lamprophyre" composed of phenocrysts of green hornblende or clinopyroxene in a ground mass of sodic plagioclase, with accessory olivine, biotite, apatite, and opaque oxides. Named for Spessart, ...
Heat-treated stone
Mining; General mining
A (gem) stone that has been artificially heated to change its color.
Burnt stone
Mining; General mining
A (gem) stone that has been artificially heated to change its color.
Heated stone
Mining; General mining
A (gem) stone that has been artificially heated to change its color.
Short-term exposure limit (STEL)
Mining; General mining
A 15-min time-weighted average exposure that should not be exceeded at any time during a work day even if the 8-h time-weighted average is within the threshold limit value.
Reglette
Mining; General mining
A 12-in (0.3-m) scale divided into tenths and hundredths of a foot, used for accurate measurement in conjunction with a steel band that is graduated only in feet. See also: band chain.
Belynski's reagent
Mining; General mining
A 1% copper sulphate solution recommended as an etchant for revealing dendritic structures in high-carbon steels.
