Littleton formation Schist
Credit Line: Mineralogical and Geological Museum at Harvard University
Object number: BILLINGS-W-223
DescriptionSample contains 29% quartz, 24% biotite, 21% muscovite, 11% sillimanite, 10% plagioclase, 3% garnet, 2% staurolite, and trace amounts of apatite. Foliation is present with mica grains (≤ 1 cm thickness).