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Lecture 8

Lecture 8 - Minerals

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Earth Sciences
Earth Sciences 1083F/G
Cameron Tsujita

Lecture 8Minerals cont y Phosphates o The form of phosphate called hydroxyapatite is a very important constituent of bones and teeth in vertebrate animals o Gives bones and teeth their great strength and provides animals phosphate for other purposes y Sulphides o Not only formed by inorganic processes o Also readily formed by organisms through their metabolic activities o Eg in a complex series of reactions sulphurreducing bacteria use 2in water for energy and produce the dissolved sulphate SO4poisonous smelly gas called hydrogen sulphide HS 2o Hydrogen sulphide can then react with dissolved iron to form the mineral pyrite FeSPyrite is an important mineral in fossil 2preservation y Halides o Contains members of the halides family of ions eg Cl F o Important indicator of climatic conditions eg halide deposited as a result of seawater becoming too salty to hold all its
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