hydrotroilite

hydrotroilite

[‚hī·drō′trȯi‚līt]
(mineralogy)
FeS· n H2O A black, finely divided colloidal material reported in many muds and clays; thought to be formed by bacteria on bottoms of marine basins.
References in periodicals archive ?
These beds are overlain by black or dark-grey clay containing hydrotroilite.
The Ancylus Lake deposits, ranging in thickness from some centimetres to 4-5 m, begin with the so-called lower hydrotroilite bed having a distinct undulating lower boundary (discontinuity surface).
The lower hydrotroilite bed in the Ancylus Lake deposits serves as the upper boundary of the distribution of this flora in the vertical section.