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Top One Silica Mica Feldspar Dryer Machine Ppt In South Africa

1 dark or ferromagnesian silicates rich in iron and magnesium and comparatively low in silica olivine pyroxene amphibole and biotite mica are the common dark silicate minerals of earths crust 2 light or nonferromagnesian silicates contain greater amounts of potasium sodium and calcium rather than iron and magnesium.

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