argillite


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argillite

[′är·jə‚līt]
(petrology)
A compact rock formed from siltstone, shale, or claystone but intermediate in degree of induration and structure between them and slate; argillite is more indurated than mudstone but lacks the fissility of shale.

argillite

A rock containing chiefly clay materials; derived from claystone, siltstone, or shale; used locally as building stone, although rarely produced commercially.
References in periodicals archive ?
In argillite rock, the minerals glauconite, phengite and illite, observed by DRX, constitute the main potential K sources (Figure 1C).
Magic Leaves: A History of Haida Argillite Carving.
Between the Cambrian sand- and siltstones and Ordovician limestones occur the major sources of Rn: Lower-Ordovician obolus sandstone with P-rich layers of phosphorite that are overlain by graptolite argillite.
The flows are variably massive, vesicular, pillowed and autobrecciated, and in places contain interbeds of tuff and argillite.
A brief recounting of some of the large public pieces--Reid kept up a tireless parallel production of miniatures, small jewellery, gold and silver pieces, argillite carvings, for private sale or for gifts, throughout his career--gives the story: the Skidegate Band Council house pole (a copy of one of the Tanu poles) raised in 1978, the first pole-raising ceremony in Haida Gwaii since the turn of the 20th century; the yellow cedar sculpture "Raven and the First Men," completed for the UBC Museum of Anthropology in 1980; the bronze "Chief of the Undersea World," at the entrance of the Vancouver Aquarium, 1983-84; the "Loo Taas," the first sea-going red cedar canoe (it is 15.
In the beginning, nearly two centuries ago, Haida argillite sculpture was invented, carved and sold solely for the Euro-American market.
These units include carbonates (limestone and dolomite), argillite, siltstone, quartzite, phyllite and schist.
Geologists estimate that a staggering 15 miles of greywacke and argillite rock were pushed up from the sea floor during this displacement, forming the Southern Alps, the majestic backbone of Te Wahipounamu.