Lamprophyres (Greek λαµπρός (lamprós) = `bright` and φύρω (phýro) = to mix) are uncommon, small volume ultrapotassic igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions. They are alkaline silica-undersaturated mafic or ultramafic rocks with high magnesium oxide, >3% potassium oxide, high so.....
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http://en.wikipedia.org/wiki/Lamprophyre
any of a group of dark gray to black intrusive igneous rocks that generally occur as dikes (tabular bodies inserted in fissures). Such rocks are ...
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http://www.britannica.com/eb/a-z/l/10
lamprophyre An igneous rock that occurs mainly as an intrusion, or dike, containing large crystals; especially, of biotite and mica.
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http://www.wordinfo.info/words/index/info/view_unit/1144/
An igneous rock composed of dark minerals that occurs in dykes; sometimes contains diamonds.
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https://www.encyclo.co.uk/local/22734
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