I think you are right that it is hornfels.


HTH


Sheila


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C-1 C cabalgar vtr to overlap | to thrust, overthrust cabalgador ...
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corneana nf hornfels. cornelina nf cornelian chalcedony. córneo,-ea adj horny ... cuarcita nf quartzite | c. feldespática arkosite ...
studentsacrossborders.arizona.edu/glossary/C.pdf - Pàgines semblants


http://209.85.135.104/search?q=cache:p0Jyozsc2TcJ:studentsac...



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Hornfels (German, meaning "hornstone") is the group designation for a series of contact metamorphic rocks that have been baked and indurated by the heat of intrusive igneous masses and have been rendered massive, hard, splintery, and in some cases exceedingly tough and durable. Most hornfelses are fine-grained, and while the original rocks (such as sandstone, shale and slate, limestone and diabase) may have been more or less fissile owing to the presence of bedding or cleavage planes, this structure is effaced or rendered inoperative in the hornfels. Though they may show banding, due to bedding, etc., they break across this as readily as along it; in fact, they tend to separate into cubical fragments rather than into thin plates. The most common hornfelses (the biotite hornfelses ) are dark-brown to black with a somewhat velvety luster owing to the abundance of small crystals of shining black mica. The lime hornfelses are often white, yellow, pale-green, brown and other colors. Green and darkgreen are the prevalent tints of the hornfelses produced by the alteration of igneous rocks. Although for the most part the constituent grains are too small to be determined by the unaided eye, there are often larger crystals of garnet or andalusite scattered through the fine matrix, and these may become very prominent on the weathered faces of the rock.

http://en.wikipedia.org/wiki/Hornfels




Hornfels
Cordierite hornfels, which contains crystals of cordierite; andalusite hornfels, which contains crystals of andalusite; pyroxene hormfels, which contains ...
www.geocities.com/RainForest/Canopy/1080/hornfels.htm - 14k - Còpia en memòria - Pàgines semblants

Rocas metamorficas: corneana
Corneana de cordierita. Matriz de diminutos cristales de biotita, cuarzo y moscovita con grandes porfiroblastos ovales de cordierita. ...
edafologia.ugr.es/Rocas/cornea.htm - 2k - Còpia en memòria - Pàgines semblants
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Asociaciones minerales ms comunes en los diferentes tipos de rocas ...
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grado, donde los poiquiloblastos son de andalucita o cordierita. ... Corneana. Roca sin esquistosidad, de tamaño de grano fino a muy fino, compuesta por ...
gmg.unizar.es/gmgweb/Asignaturas/EndogenaII/metamorfismo_nuevo/apuntes/tema_00_2006.pdf - Resultat complementari - Pàgines semblants

# A dense, compact rock produced from slate by contact with an intrusion, especially of granite.
museum.gov.ns.ca/mnh/nature/nhns2/glossary.htm

# a fine-grained rock composed of a mosaic of equidimensional grains without preferred orientation (foliation) and typically formed by contact metamor-phism.
www.tc.umn.edu/~smith213/Glossary GP.htm

# A nonfoliated metamorphic rock of uniform grain size, formed by high-temperature metamorphism, typically formed by contact metamorphism around igneous intrusions.
imnh.isu.edu/digitalatlas/glossary/letter.asp

# Rock that undergoes metamorphism simply because of a change in temperature, without being subjected to differential stress.
www.wwnorton.com/college/geo/earth2/glossary/h.htm

# a fine-grained metamorphic rock formed by the action of heat on clay rocks
wordnet.princeton.edu/perl/webwn

# Hornfels (German, meaning "hornstone") is the group designation for a series of rocks that have been baked and indurated by the heat of intrusive granitic masses and have been rendered massive, hard, splintery, and in some cases exceedingly tough and durable. ...
en.wikipedia.org/wiki/Hornfels


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Note added at 13 mins (2006-11-28 09:23:57 GMT)
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Rocas metamorficas: corneana
Corneana (hornfels). Roca metamórfica de muy alta temperatura, típicamente del metamorfismo de contacto. Corneana de cordierita. ...
edafologia.ugr.es/Rocas/cornea.htm - 2k - Còpia en memòria - Pàgines semblants
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Vocabulario General
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corneana: hornfels. corriente litoral: longshore current. corte y relleno: cut and fill. corteza de pan: breadcrust. corto plazo: short-term. costa: shore ...
satori.geociencias.unam.mx/LGM/espa-ing.pdf - Pàgines semblants

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Note added at 15 mins (2006-11-28 09:26:00 GMT)
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Tengo que reconocer que el término español de corneana suena bastante mejor que su equivalente en inglés o alemán (Hornfels). Las corneanas son conocidas como rocas cuya apariencia puede variar ampliamente. Normalmente son bastante oscuras, incluso negras, muy duras y densas y no tienen el pulido intenso del basalto o gabro. Se consideran piedras poco llamativas.

http://www.graniteland.com/forum/index.php?PHPSESSID=c16facd...