NEWSLETTER 6 : Aluminum
(Updated February 2012)
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Aluminum is one of the eight most abundant elements on earth. Those elements are Oxygen, Silicon, Aluminum,
Iron, Calcium, Sodium, Potassium and Magnesium. Together those 8 elements form 98% of the earth crust.
||% of total
Table 1: The eight most common elements of the earth crust by
In nature aluminum does not exist as a
In nature aluminum exists only combined to other elements, forming most frequently hydroxydes (L), sulfates (L), silicates (L) .
silicates (Ex) Si4+ ions are replaced by Al3+ ions within the silicate
tetrahedral. To maintain charge balance, an extra cation,
such as K+, must accompany each of those substitutions.
One quarter substitution of the minerals Si4+ ions by Al3+ ions results in
Muscovite (Ex) :
Up to half substitution of the minerals Si4+ ions by A3+ ions results in
feldspar (Ex) with Na+, K+, or Ca2+ ions to compensate the extra
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