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primary rocks

   Also found in: Dictionary/thesaurus 0.02 sec.
primary rocks [′prī‚mer·ē ′räks]
(petrology)
Rocks whose constituents are newly formed particles that have never been constituents of previously formed rocks and that are not the products of alteration or replacement, such as limestones formed by precipitation from solution.


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The well-rounded pebbles of porphyry were mingled with many immense angula fragments of basalt and of primary rocks.
 
 
 
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