Earth Sciences 1081A/B Lecture Notes - Lecture 4: Oxide Minerals, Hydroxylapatite, Ion

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Halides (containing halide ions, e. g. - oxides/ hydroxides (containing oxide. Important constituent of bones and teeth in vertebrate animals. Gives bones and teeth their great strength. Light coloured: will often turn to a brown to black colour when altered (hence why dinosaur bones are often brown. This group does not directly tell you the name of the anion. Most common halide ions are chloride and fluoride. Important indicator for climate conditions: e. g. most halides are deposited because of seawater becoming too salty to hold all its salt in solution. Salt deposits are good indicators of seas located in hot, dry climates. Important halide because it is a good source of fluoride. Incorporated in minor amount in bones and teeth, providing extra strength. Hematite is a major component of rust (this is what gives rust its red colour) Common weathering product of other iron minerals. Bacteria are important mediators of rust formation. Bacteria use this property to their advantage.

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