skeleton grain

skeleton grain

[′skel·ət·ən ‚grān]
(geology)
A relatively stable and not readily translocated grain of soil material, concentrated or reorganized by soil-forming processes.
References in periodicals archive ?
The coarse mineral skeleton grains vary in shape from angular to rounded, are mostly poorly sorted, and of variable sphericity.
The argillans here occur primarily as limpid-speckled, continuous, and non-continuous laminated coatings around skeleton grains, packing voids and channels.