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{{Unreferenced stub|auto=yes|date=December 2009}} |
{{Unreferenced stub|auto=yes|date=December 2009}} |
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'''Norite''' is a [[mafic]] [[intrusive]] [[igneous rock]] composed largely of the [[calcium]]-rich [[plagioclase]] [[labradorite]] and [[hypersthene]] with [[olivine]]. Norite is essentially indistinguishable from [[gabbro]] without [[thin section]] study under the [[petrographic microscope]]. It occurs with gabbro and other mafic to [[ultramafic]] rocks in [[layered intrusion]]s which are often associated with [[platinum]] [[ore]]bodies such as in the Bushveld Igneous Complex in [[South Africa]], the [[Skaergaard intrusion|Skaergaard igneous complex]] of [[Greenland]], and the [[Stillwater igneous complex]] in [[Montana]], [[USA]]. Norite is also the basal igneous rock of the [[Sudbury Basin]] complex in [[Ontario]] which is the site of a [[impact event|meteorite impact]] and the world's second largest [[nickel]] mining region. Norite is a common rock type of the [[Moon rock|Apollo samples]]. On a smaller scale, norite can be found in small localized [[intrusion]]s such as the Gombak Norite in [[Bukit Gombak]], [[Singapore]]. |
'''Norite''' is a [[mafic]] [[intrusive]] [[igneous rock]] composed largely of the [[calcium]]-rich [[plagioclase]] [[labradorite]] and [[hypersthene]] with [[olivine]]. Norite is essentially indistinguishable from [[gabbro]] without [[thin section]] study under the [[petrographic microscope]]. It occurs with gabbro and other mafic to [[ultramafic]] rocks in [[layered intrusion]]s which are often associated with [[platinum]] [[ore]]bodies such as in the Bushveld Igneous Complex in [[South Africa]], the [[Skaergaard intrusion|Skaergaard igneous complex]] of [[Greenland]], and the [[Stillwater igneous complex]] in [[Montana]], [[USA]]. Norite is also the basal igneous rock of the [[Sudbury Basin]] complex in [[Ontario]] which is the site of a [[impact event|meteorite impact]] and the world's second largest [[nickel]] mining region. Norite is a common rock type of the [[Moon rock|Apollo samples]]. On a smaller scale, norite can be found in small localized [[intrusion]]s such as the Gombak Norite in [[Bukit Gombak]], [[Singapore]]. Additionally, in organic chemistry laboratories, norite is a charcoal used as a decolorizing agent. |
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The name ''Norite'' is derived from the Norwegian name for Norway: '''Norge'''. |
The name ''Norite'' is derived from the Norwegian name for Norway: '''Norge'''. |
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Norite is a mafic intrusive igneous rock composed largely of the calcium-rich plagioclase labradorite and hypersthene with olivine. Norite is essentially indistinguishable from gabbro without thin section study under the petrographic microscope. It occurs with gabbro and other mafic to ultramafic rocks in layered intrusions which are often associated with platinum orebodies such as in the Bushveld Igneous Complex in South Africa, the Skaergaard igneous complexofGreenland, and the Stillwater igneous complexinMontana, USA. Norite is also the basal igneous rock of the Sudbury Basin complex in Ontario which is the site of a meteorite impact and the world's second largest nickel mining region. Norite is a common rock type of the Apollo samples. On a smaller scale, norite can be found in small localized intrusions such as the Gombak Norite in Bukit Gombak, Singapore. Additionally, in organic chemistry laboratories, norite is a charcoal used as a decolorizing agent.
The name Norite is derived from the Norwegian name for Norway: Norge.
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