Labradorite is a type of anorthite (plagioclase feldspar) mineral under the feldspar group, which crystallizes as either small grains, tabular crystals, or masses. It is frequently found as twins (two crystals joined together). The mineral composition of labradorite is a complex molecular bond of sodium, calcium, and aluminum silicates. - (Na,Ca)AlSi3O8
The hardness of labradorite is [...]