hornstone

(ˈhɔːnˌstəʊn)

(Minerals) another name for chert, hornfels

[C17: translation of German Hornstein; so called from its appearance]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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Noun

hornstone - a fine-grained metamorphic rock formed by the action of heat on clay rocks

hornfels

metamorphic rock - rock altered by pressure and heat

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References in periodicals archive

Meyn (1874) described silicifications from the Isle of Sylt as 'lavender-blue hornstone'.

Ordovician sponges (Porifera) and other silicifications from Baltica in Neogene and Pleistocene fluvial deposits of the Netherlands and northern Germany/Ordoviitsiumi kasnad (Porifera) ja teised ranistunud fossiilid Pohja-Saksamaa ning Hollandi Neogeeni ja Pleistotseeni fluviaalsetes setetes

The aggregate obtained though the breaking up of hornstone, ie silified limestone, has also been used in tests.

Testing alkali-reactivity of selected concrete aggregates

Jackson, in his Report on the Geology of Maine, in 1838, says of this mountain: "Hornstone, which will answer for flints, occurs in various parts of the State, where trap-rocks have acted upon silicious slate.

The Allegash and East Branch

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