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basalt    音標拼音: [bəs'ɔlt]
n. 玄武巖

玄武岩

basalt
n 1: the commonest type of solidified lava; a dense dark grey
fine-grained igneous rock that is composed chiefly of
plagioclase feldspar and pyroxene

Basalt \Ba*salt"\, n. [L. basaltes (an African word), a dark and
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]

40 Moby Thesaurus words for "basalt":
aa, abyssal rock, bedrock, block lava, brash, breccia,
conglomerate, crag, druid stone, festooned pahoehoe, gneiss,
granite, igneous rock, lava, limestone, living rock, magma,
mantlerock, metamorphic rock, monolith, pahoehoe, pillow lava,
porphyry, pudding stone, regolith, rock, ropy lava, rubble,
rubblestone, sandstone, sarsen, schist, scoria, scree,
sedimentary rock, shelly pahoehoe, stone, talus, tufa, tuff

Basalt, CO -- U.S. town in Colorado
Population (2000): 2681
Housing Units (2000): 1218
Land area (2000): 1.922180 sq. miles (4.978423 sq. km)
Water area (2000): 0.018520 sq. miles (0.047967 sq. km)
Total area (2000): 1.940700 sq. miles (5.026390 sq. km)
FIPS code: 04935
Located within: Colorado (CO), FIPS 08
Location: 39.368382 N, 107.038263 W
ZIP Codes (1990): 81621
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords:
Basalt, CO
Basalt


Basalt, ID -- U.S. city in Idaho
Population (2000): 419
Housing Units (2000): 133
Land area (2000): 0.287416 sq. miles (0.744405 sq. km)
Water area (2000): 0.000000 sq. miles (0.000000 sq. km)
Total area (2000): 0.287416 sq. miles (0.744405 sq. km)
FIPS code: 05230
Located within: Idaho (ID), FIPS 16
Location: 43.314270 N, 112.163571 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords:
Basalt, ID
Basalt

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  • Basalt - Wikipedia
    An aphanitic (fine-grained) igneous rock is classified as basalt when its QAPF fraction is composed of less than 10% feldspathoid and less than 20% quartz, and plagioclase makes up at least 65% of its feldspar content This places basalt in the basalt andesite field of the QAPF diagram
  • Basalt – Formation, Properties, Characteristics
    Basalt is the most abundant volcanic rock on Earth, covering more than 90% of the ocean floor and large continental regions shaped by ancient lava flows It forms when mafic magma, rich in iron and magnesium but low in silica, erupts from the mantle and cools rapidly at or near the surface
  • Basalt: Igneous Rock - Pictures, Definition, Uses More
    Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill It has a composition similar to gabbro
  • Basalt | Definition, Properties, Facts | Britannica
    Basalt, extrusive igneous (volcanic) rock that is low in silica content, dark in color, and comparatively rich in iron and magnesium Basalts may be broadly classified on a chemical and petrographic basis into two main groups: the tholeiitic and the alkali basalts
  • Basalt: Composition, Properties, Types, Uses – Geology In
    Basalt is defined as a fine-grained, dark-colored igneous rock composed mainly of plagioclase and pyroxene minerals, with or without olivine It is formed from the rapid cooling of basaltic lava exposed at or very near the surface of the Earth (extrusive or volcanic rock)
  • A Guide to Basalt: A Common, Fine-grained, Dark-Colored . . .
    Basalt is a common and widely used, fine-grained, dark-colored mafic volcanic rock It has mainly calcic plagioclase feldspar and augite
  • Basalt: Identification, Pictures Info for Rockhounds
    Basalt is an extrusive igneous rock composed primarily of plagioclase feldspar and large amounts of mafic minerals like pyroxene It has an aphanitic texture, meaning its interlocking crystals cannot be seen by the naked eye





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