Lecture 5 Jan 30 2008 Silicate minerals

Lecture 5 Jan 30 2008 Silicate minerals - Minerals form by...

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Minerals form by crystallization , or the growth of a solid from a gas or liquid whose constituent atoms come together in the proper proportions and take on a crystalline arrangement. freezing -- as a magma cools below its melting point
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As ions enter into bonds, their sizes determine how they are arranged in a crystalline structure. Large anions occupy most of the space of the atomic structure. Small cations fit in among the anions.
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The silica tetrahedron is the basic building block of all silicate minerals. The tetrahedron may bond with cations or it may coordinate with other tetrahedra.
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olivine Fe 2 SiO 4 pyroxene FeSiO 3
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amphibole Ca 2 Fe 5 Si 8 O 22 (OH) 2
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mica KFe 3 AlSi 3 O 10 (OH) 2
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Three-dimensional framework quartz SiO 2
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describes light- colored igneous rocks and minerals that are poor in iron and magnesium and rich in silicon. Minerals like quartz and feldspar. Mafic describes dark- colored igneous rocks and minerals that are rich in iron and magnesium and poor in silicon. Minerals like pyroxene and olivine. augite is a pyroxene
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This note was uploaded on 04/11/2008 for the course EVSC 280 taught by Professor Herman during the Spring '08 term at UVA.

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Lecture 5 Jan 30 2008 Silicate minerals - Minerals form by...

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