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hard species of marble found in Ethiopia: cf. F. basalte.] 1. (Geol.) A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated. [1913 Webster] Note: It is usually of a greenish black color, or of some
dull brown shade, or black. It constitutes immense beds
in some regions, and also occurs in veins or dikes
cutting through other rocks. It has often a prismatic
structure as at the Giant s Causeway, in Ireland, where
the columns are as regular as if the work of art. It is
a very tough and heavy rock, and is one of the best
materials for macadamizing roads.
[1913 Webster]
2. An imitation, in pottery, of natural basalt; a kind of
black porcelain.
[1913 Webster]
Source: The Collaborative International Dictionary of English
Páginas en idoneos.com
Patagonia volcánica
Volcanes patagónicos pertenecientes al Anillo de Fuego del Pacífico. Proceso de formación de volcanes: subducción, puntos calientes. Tipos de rocas volcánicas.
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