This document provides information on the physical properties and identifying characteristics of various common rock-forming minerals. It includes each mineral's name, typical color, hardness on the Mohs scale, cleavage or lack thereof, streak or other distinguishing features. Key minerals described are quartz, feldspar, mica, amphibole, pyroxene, olivine, calcite, and garnet. The document emphasizes that crystal shape is different from cleavage, and that minerals can appear in crystalline or massive forms.