Albite or soda-feldspar is a widely distributed, rock-forming mineral present in pegmatite dikes and may be found in crystals. It has the formulae NaAlSi3O8 and a relative hardness of 7. Albite is a form of feldspar, and is usually white in colour, hence its name, but is occasionally bluish, grayish, greenish, or reddish white. Research Albite