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accessory mineral

   Also found in: Encyclopedia 0.02 sec.
accessory mineral
n.
A mineral that is present in a minor amount in rocks and is not considered an essential constituent of the rock.

accessory mineral
A mineral that is present in a minor amount in rocks and is not considered an essential constituent of the rock.


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The most likely accessory mineral is gold which may have originated in underlying Birimian basement which was later remobilized during a Late Proterozoic hydrothermal event associated with the Buem Formation volcanism.
Gangue minerals are ankerite, sericite, and chlorite, and accessory minerals formed from the breakdown of mafic minerals in the host rock.
 
 
 
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