Primitive rocks

(Geol.) primary rocks. See under Primary.

See also: Primitive

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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For the next twenty-eight mile the river-course was encumbered with these basaltic masses Above that limit immense fragments of primitive rocks derived from its surrounding boulder-formation, wer equally numerous.
The drifted trunk of a tree, or boulder of primitive rock, was hailed with joy, as if we ha seen a forest growing on the flanks of the Cordillera.
Most of the meteorites that fall to Earth are chondrites - compositionally primitive rocks rich in both silicates and metallic iron-nickel.
The spectra reveal that the relative amounts of magnesium, silicon, and aluminum on Eros are the same as those in ordinary chondrites, which rank among the most primitive rocks in the solar system, says Jacob I.