gabbro
gabbro A coarse-grained,
basic igneous rock, consisting of
essential calcium-rich
plagioclase feldspar (approximately 60%),
clinopyroxene (
augite or titanaugite), and
orthopyroxene (
hypersthene or
bronzite), plus or minus
olivine with
accessory magnetite or
ilmenite. Gabbros result from the slow crystallization of
magmas of basaltic composition, and like the
basalts they can be divided into tholeiitic and alkali types (compare
ALKALI BASALT; and
THOLEIITE). Tholeiitic gabbros are characterized by the presence of two pyroxene types (augite and hypersthene) and
interstitial silica-rich
glass, whereas alkali gabbros are characterized by one calcium/titanium-rich pyroxene (titanaugite) and scattered interstitial feldspathoid minerals. Many large gabbroic
intrusions display mineral layering, testifying to the complex processes taking place within basic
magma chambers. Gabbros are commonly found intruded as ring complexes (e.g. Ardnamurchan and Skye in Scotland), large
lopoliths (Bushveld complex, S. Africa), or layered complexes (Skaergaard in eastern Greenland being the most famous).
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Axis Communications to exhibit new network video products at IFSEC 2005; Axis Communications extends network video range in time for IFSEC 2005.
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M2 Presswire; 2/9/2006; 700+ words
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AXIS Capital Announces Strategic Realignment of Organizational Structure.
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Axis helps secure Beauchamps High School.
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Axis to launch four new network cameras and competition for visitors to IIPSEC stand.
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Axis named as network camera market leader in JP Freeman Research Report.
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Axis Powers
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declination axis
Book article from: A Dictionary of Astronomy
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Axis
Book article from: A Dictionary of Twentieth-Century Art
Axis. A magazine devoted to contemporary art...Piper . In the first issue (January 1935) Axis was described as ‘a quarterly review...lion and it was originally intended that Axis should parallel the concerns of the Paris...
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axis
Book article from: A Dictionary of Biology
axis The second cervical vertebra , which articulates...the skull). The articulation between the axis and atlas in reptiles, birds, and mammals...side movement of the head. The body of the axis is elongated to form a peg (the odontoid...
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axis, rotation
Book article from: A Dictionary of Astronomy
axis, rotation The imaginary line around which a body spins. The axis of rotation joins a body's north and south poles.
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