Lecture15 - Feldspars(K,Na,Ca)AlSi3O8 Density 2600-2800...

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Minerals Solid, inorganic substances that make up rocks A list of the most important: Feldspars (K,Na,Ca)AlSi 3 O 8 ¾ Density: 2600-2800 kg/m 3 . ¾ Most common mineral in terrestrial surface rocks; even more common on the moon. ¾ Tend to float in magmas and form surface crust Quartz (silica: SiO 2 ): ¾ Density 2600 kg/m 3 . ¾ Even less dense than many feldspars ¾ One of the first to solidify from magma, after the feldspars Pyroxenes (Mg, Fe, Ca, Na, Al and Ti silicates): ¾ high density, 2800-3700 kg/m 3 . ¾ Common in meteorites and igneous rocks, but only 10% of Earth’s crust. Ampiboles and Micas: ¾ Like pyroxenes, but different crystal structure ¾ Slightly less dense
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Beyond the asteroid belt, ice becomes a major “mineral” constituent of terrestrial bodies. Water ice ¾ Density 917 kg/m 3 (at standard temperature and pressure) ¾ Dominates the surfaces of many moons and ring particles ¾ Main constituent of most comets ¾ Also present in the polar caps of inner planets (Mars and Earth) Carbon dioxide ice: ¾ Density 1560 kg/m 3 . ¾ Begins to sublime at about 10 AU from the Sun. Ammonia ice: ¾ Density 817 kg/m 3 . ¾ Low melting point (195 K), so could be fluid or gas in some slightly heated bodies Methane ice: ¾ Low density, 415 kg/m 3 . ¾ Very volatile, low melting temperature. The first to sublime in comets approaching the Sun. ¾ Only condenses on most distant bodies. ¾
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Lecture15 - Feldspars(K,Na,Ca)AlSi3O8 Density 2600-2800...

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