EXERCISE 3.8 Everyday Uses of Minerals Name: Course: Section: Date: In f ollowin

Question

EXERCISE 3.8 Everyday Uses of Minerals Name: Course: Section: Date: In f ollowing table, indicate what physical property you think would make a mineral appropriate for the use indicated, and e a mineral from your set that could be used for this purpose. In some instances, more than one mineral will meet the equirements and more than one property is required Minerals Physical property or properties needed Economic use Abrasives (e.g, sandpaper) Old-time window coverings before glass was widely available Modern window panes Writing on paper Lubricant for locks After-bath powder Bright eye shadow Pigment for paints Navigation with a compass

Explanation / Answer

Physical property Mineral Harder then the surface which needed to be polished (hard minerals (rated at 7 or above on Mohs scale of mineral hardness)) Sand, pumice, diamond Transparency Mica sheets Transparency Glass Softness: Softer than paper Graphite Lubricant: Lubricity Oil, graphite powder water absorbance Talc glittery, shiny Mica Paint pigments: wavelength-selective absorption mercury sulfide, cadmium sulfid Compass: Strong Magnatism Magnetite; iron, steel, cobalt, nickel

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