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Using determined heating and cooling points and times on a substance, material or alloy to achieve a desired increase in hardness or malleability

An orthorhombic mineral 4[CaCO3]; having acicular, pyramidal, tabular, reniform, columnar, or stalactitic habits; a precipitant formed from hot carbonated water in springs, cavities in basalt, or biologically in shells and pearls (mother of pearl)

A trigonal mineral of the dolomite group, Ca(Fe,Mg,Mn)(CO3)2

Having to do with water

A substance containing no water

A corrosive, noxious, yellow liquid made with nitric and hydrochloric acids, usually one part nitric acid and three parts hydrochloric acid. Used in efficiently dissolving and processing gold and platinum

A type of grey to black volcanic rock composed mostly of silica, plus iron and magnesium

Any item or instrument from which a price or purpose may be assigned

The amount of work required to be performed, by law, in order to retain possession of mining rights