
1) Hornstone 2) Metamorphic rock 3) Metamorphic rock
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https://www.crosswordclues.com/clue/hornfels

1) Hornstone
Found on
https://www.crosswordclues.com/clue/hornfels

Hornfels (German, meaning `hornstone`) is called so because of its exceptional toughness and texture both reminiscent of animal horns. These properties are due to fine grained non-aligned crystals with platy or prismatic habits. Hornfels is the group designation for a series of contact metamorphic rocks that have been baked and indurated by the .....
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http://en.wikipedia.org/wiki/Hornfels

(from the article `metamorphic rock`) The hornfels are formed by contact metamorphism and typically show little sign of the action of directed pressure. They are fine-grained rocks in ...
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http://www.britannica.com/eb/a-z/h/70

A hard, dark-colored, dense metamorphic rock that forms from the intrusion of magma into shale or basalt.
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http://www.encyclo.co.uk/local/22291

A high-temperature, low-pressure metamorphic rock of uniform grain size showing no foliation. Usuall
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http://www.encyclo.co.uk/local/22392

Hornfels is a fine-grained metamorphic rock formed mainly from sedimentary rocks and volcanic tuff in zones of contact metamorphism surrounding igneous intrusions, especially granitic masses, at high temperature and extremely high pressures often at great depths within the Earth's crust. Various varieties of
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http://www.probertencyclopaedia.com/browse/HH.HTM

A high-temperature, low-pressure metamorphic rock of uniform grain size showing no foliation. Usually formed by contact metamorphism.
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http://www.scientificpsychic.com/etc/geology-glossary.html

[
n] - a fine-grained metamorphic rock formed by the action of heat on clay rocks
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http://www.webdictionary.co.uk/definition.php?query=hornfels

Metamorphic rock formed by rocks heated by contact with a hot igneous body. It is fine-grained, brittle, and lacks foliation (a planar structure). Hornfels may contain minerals only formed under conditions of great heat, such as andalusite, Al
2SiO
5, and cordierite, (Mg,Fe)
2Al&...
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https://www.encyclo.co.uk/local/21221

A fine-grained contact metamorphic rock.
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https://www.encyclo.co.uk/local/22734

a dark, fine-grained metamorphic rock, the result of recrystallization of siliceous or argillaceous sediments by contact metamorphism.
Found on
https://www.infoplease.com/dictionary/hornfels
No exact match found.