For the following pair of voltaic cell electrodes, Cd-Cr, immersed in their salt solutions, identify the anode and cathode, and write the
following:
1. the anode half-reaction
2. the cathode half-reaction
3. the overall net equation the cell voltage produced
4. the standard cell notation
5. calculate E

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

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