"Schistous" is a word in ENGLISH

Alt. of Alum shale

An earth abounding in pyrites, used by the ancients to kill insects, etc., on vines; -- applied by Brongniart to …

Argillaceous schist or slate; clay slate. Its colors is bluish or blackish gray, sometimes greenish gray, brownish red, etc.

A name given to the series of sandstones and schists overlying the true nummulitic formation in the Alps, and included …

Laminated, but restricted to the variety of laminated structure found in crystalline schist, as mica schist, etc.; schistose.

The sparingly fossiliferous conglomerates, grits, schists, and states of Great Britain, which lie at the base of the Cambrian system; …

Partaking of the nature of, or consisting of, mica and lime; -- applied to a mica schist containing carbonate of …

A micaceous mineral occurring in small scales. It is characteristic of certain crystalline schists.

A kind of mica related to muscovite, but containing soda instead of potash. It is characteristic of the paragonite schist …

Clay slate; argillaceous schist.

Any crystalline rock having a foliated structure (see Foliation) and hence admitting of ready division into slabs or slates. The …

A kind of muscovite occuring in silky scales having a fibrous structure. It is characteristic of sericite schist.

An argillaceous rock which readily splits into thin plates; argillite; argillaceous schist.

A mineral of a brown to black color occurring in prismatic crystals, often twinned so as to form groups resembling …