Albite is a Feldspar of the Albite-Anorthite Series, usually white to grey in color though sometimes found in hues of red, green and blue.
Chemical composition: Na(AlSi3O8); Hardness: 6-6.5
Orthoclase is a member of the Feldspar group, specifically the alkali feldspar series, which includes Albite. Orthoclase presents in earthy tones and is an essential component of granite. It is an abundant mineral on Earth and has been identified on the Moon and Mars.
Chemical composition: K(AlSi3O8); Hardness: 6