Sample Mineral Identification Key Properties Mineral Calcite Feldspar Mica Talc Gypsum Quartz Fluorite Magnetite Hardness (scratch test) 3 scratched by nail 6 scratches glass 2 scratched by fingernail 1 easily scratched by fingernail 2 scratched by fingernail 7 scratches glass 4 scratched by nail 4 scratched by nail Color Luster Special Properties white dull/glassy bubbles with acid pink or white dull/pearly --- black/gray shiny splits into thin sheets white dull --- white/gray dull --- various colors glassy --- various colors glassy --- black shiny magnetic Students should be able to use a mineral identification key (like the sample above) to answer various questions such as: Which minerals have a dull luster? Which minerals are white in color? Which mineral is white, dull, and has the softest material? Which mineral has a dull luster, is white in color, and can be scratched by a nail? Which mineral comes in many different colors and can scratch all other minerals? Which white mineral bubbles in acid? Which mineral can scratch glass and has a glassy luster? Which mineral comes in many different colors and has a hardness of 4? Which shiny, gray mineral is soft and can be split into thin sheets? Starting with the softest mineral, how would you put the minerals in order according to hardness?