Objectives • Physical properties of minerals and mineral identification in hand specimens.

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Presentation transcript:

Objectives • Physical properties of minerals and mineral identification in hand specimens

Colors: Birth Stones Jan_garnet April_diamond Jul_ruby Oct_opal Aug_peridot Nov_citrine Feb_amethyst May_emerald Sep_sapphire Dec_blue topaz Mar_aquamarine Jun_pearl

Play of colors: Labradorite

Streak: The red planet

Alteration: Tiger’s eye, cat’s eye

Crystal form: Fluorite on quartz

Crystal form: MnCO3

Twinning: calcite (CaCO3)

State of Aggregate: stalagmites calcite

State of Aggregate: Botryoidal hematite

State of Aggregate: Bladed gypsum (CaSO4•2H2O)

Choncoidal fracture: obsidian, Volcanic silica glass, SiO2

Mohs hardness scale baby powder quartz in watch, decoration highway pavement: calcite diamond: engagement corundum: industry cutting grinding fluorite: tooth paste Gypsum: - sulfate, with 2H2O - plaster of paris, with 0.5H2O, calcined gypsum - unlike - sheetrock - dry wall = two heavy paper + gypsum, also known as plasterboard or gypsum board low thermal conductivity, feel warmer than a like crystal of quartz mortar: a mixture of sand, a binder such as cement or lime, and water. applied as a paste and set hard. Portland cement is primarily made of limestone, certain clay minerals, and gypsum.