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Mineral Classification PowerPoint PPT Presentation


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Mineral Classification . In case you haven’t figured it out!. Minerals are classified by chemical composition . 1. Minerals with the same anion or anionic group have unmistakable family resemblances. For example, the carbonates resemble each other more closely than say the minerals of Cu.

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Mineral Classification

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Mineral classification l.jpg

Mineral Classification

In case you haven’t figured it out!


Minerals are classified by chemical composition l.jpg

Minerals are classified by chemical composition

  • 1. Minerals with the same anion or anionic group have unmistakable family resemblances. For example, the carbonates resemble each other more closely than say the minerals of Cu.

  • 2. They occur together in nature, for example, it is very common to find both calcite and dolomite in the same rocks.

  • 3. It agrees with the naming of inorganic compounds in chemistry.


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And at the next level

  • Once minerals have been grouped by chemical composition, they can be further separated into groups on the basis of internal structure.


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Native Elements

  • Metals

  • Semi Metals

  • Non Metals


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Sulfides

  • Including sulfarsenides; arsenides and tellurides


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Sulfosalts

  • In these minerals, As and Sb play a role more akin to metals than anions. Many important Ag minerals are sulfosalts.


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Oxides

  • a) simple and multiple where O combines with one or metals (cations)

    • Simple

    • Multiple

  • b) hydroxides with OH- group and H2O molecules


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Halides

  • these minerals have Cl, Br, F, and I as anions


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Carbonates

  • Based on the carbonate radical

  • Hexagonal; orthorhombic; and monoclinic

  • You have examples of all three!


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Nitrates

  • NO3 radical

  • Only 7 known minerals


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Borates

  • (BO3)-3 can form polymers--about 100 known minerals

    So are they iso, meso, or aniso desmic?


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Phosphates

  • (PO4)-3 are usually hydrous as well


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Sulfates

  • (SO4)-2 can be hydrous or anhydrous


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Tungstates (WO4)-2

scheelite and wolframite are both ore minerals for W


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Silicates (SiO4) -4

  • The most important group of minerals!!

    • Nesosilicates

    • Sorosilicates

    • Cyclosilicates

    • Inosilicates

    • Phyllosilicates

    • Tectosilicates


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Why can they form so many structures?

  • Mesodesmic

    • Remember this term?


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Nesosilicates


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Sorosilicates


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Cyclosilicates


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Inosilicates


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Phyllosilicates


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Tectosilicates


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What is the best way for you to remember formulas

  • General formulas!!

  • Next time


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