The ore is found in a sort of chloritic slate and iron pyrites which follow the ledge all around.
This marly deposit passes in its turn into beds containing green particles of a chloritic mineral, called the upper greensand.
The green colour is due to a chloritic mineral; the red to haematite.
Above the Chert beds is a band a few feet thick known as the chloritic Marl, which shows a passage from sand to calcareous matter.
chlorite chlo·rite2 (klôr'īt')
A salt of chlorous acid.
The inorganic group ClO2 or a salt containing it.
A usually green or black, flaky mineral that looks like mica. Chlorite is either monoclinic or triclinic and occurs in low-grade metamorphic rocks (rocks that have undergone little metamorphism). It often forms by the alteration of dark minerals (often rich in iron and magnesium) during metamorphism. Chemical formula: (Mg,Fe,Al)6(Si,Al)4O10(OH)8.