GEOL 104 Lect3

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Geological Sciences and Geological Engineering
GEOL 104
Michael T.Mc Bride

Mineral Groups98 of Earths minerals are Oxygen Silicon Aluminium Iron Calcium Sodium Potassium and MagnesiumSilicate MineralsMany minerals contain the most abundant elements silicon and oxygenSilicasiliconoxygen eg quartzSiO2Silicatesgroup of minerals containing silica eg KAlSiOorthoclase38The basic building block of all the silicate minerals is the siliconoxygen tetrahedron a 4negatively charged ion group SiO4It is possible for the siliconoxygen tetrahedron to become a double tetrahedron when a single oxygen joins to two silicons which in turn are joined to three oxygen each so then we get SiO27The more oxygens are shared the more the ratio changesreducesPyroxene is a group of minerals of single chains It has 2 cleavage chains of 90 degreesWhen trying to identify it look for something that looks like a series of stairsIlt has 2 directio
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