from The Century Dictionary and Cyclopedia
- Having in a more or less imperfect degree the character of serpentine.
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The material is a soft greenish mottled serpentine, or serpentinoid limestone.
Illustrated Catalogue of a Portion of the Collections Made During the Field Season of 1881 Third Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1881-82, Government Printing Office, Washington, 1884, pages 427-510
Up the Madrigal Creek, on the eastern margin of this tract, I found jaspers, clay-slates, sandstone, and a peculiar serpentinoid rock in place.
Five miles south of Monte Plata, I found a little exposure in the bed of a rain-water channel, where the rock was a black and green serpentinoid shale breaking into semi-lenticular masses by oblique ci-oss - cleavages and with all of the surfaces polished, resembling somewhat "slicken-sides."
In the Cretaceous belt between the Jicome and Dajao the slate is all more or less serpentinoid and of various shades of green and gray.
In the mountains on the river Cuevas Mr. Pennell found the gray sandstones of Maniel, Higuereta and las Tablas, gray clay shales similar to those on the Ocoa below Manicl, interstratified with limestone, a brownish serpentinoid rock and a pinkish, scoriaceous-looking shale with dark grains.