schist : Idioms & Phrases
Index
alum schist
Al"um schist", Al"um shale"
(Also<
- Alum schist
- Alum shale
)
Definitions
(Min.) A variety of shale or clay slate, containing iron pyrites, the decomposition of which leads to the formation of alum, which often effloresces on the rock.
Webster 1913
Argillaceous schist or state
- . See
Argillite .
Webster 1913
Hornblende schist
(Geol.) , a hornblende rock of schistose structure.
Webster 1913
Hydromica schist
(Min.) , a mica schist characterized by the presence of hydromica. It often has a silky luster and almost soapy feel.
Webster 1913
Mica schist , Mica slate
(Geol.) , a schistose rock, consisting of mica and quartz with, usually, some feldspar.