Argillaceous Definition

Argillaceous Sentence Examples

• It is not volcanic, but consists of argillaceous schist and quartzite.

• Argillaceous brown iron ore is often known in Germany as Thoneisenstein; but the corresponding term in English (clay iron stone) is applied to nodular forms of impure chalybite.

• In the mica-schists of this group biotite or muscovite may be the principal mineral and often both are present in varying proportions; the mica has developed from the argillaceous matter of the original rock; in addition there is always quartz and sometimes felspar (albite or oligoclase).

• Calc-schists are usually argillaceous limestones in which a large development of biotite or phlogopite has occasioned foliation.

• In addition to the reddish or brownish argillaceous matrix it contains fresh or decomposed crystals of volcanic minerals, such as felspar, augite, hornblende, olivine and pumiceous or palagonitic rocks.