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gravel and sand

As I look into sand and gravel, I am finding that I do not know what a
good chemical analysis of sand for aquarium use looks like. If anyone
knows acceptable or optimum levels (%) for the following chemicals, or
if this looks acceptable, I would greatly appreciate it.

Silicon Dioxide  47.20%
Aluminum Oxide  21.39%
Titanium Dioxide 1.01%
Ferric Oxide 19.23%
Calcium Oxide 6.80%
Magnesium Oxide  1.47%
Potassium Oxide  1.60%
Sodium Oxide  0.62%

Richard Hostler
Product Information Editor
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