Identification of Minerals Luster Cleavage Color Name Properties Metallic Luster Cleavage present Galena Shiny, silver-‐gray; excellent cubic cleavage No Cleavage Graphite Shiny, silver-‐gray; no form Pyrite Brassy-‐yellow; often as a collection of cubic crystals Plagioclase Light gray-‐white color; two planes of cleavage at 90° Microcline (Orthoclase) Peachy-‐pink color; two planes […]