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Lamproite
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
A group of related dark-colored intrusive or ex- trusive igneous rocks that are rich in potassium and mag- nesium and characterized by minerals, including leucite, phlogopite, and feldspars. diamondiferous varieties carry dominant olivine and lack feldspar.
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Лампроит, русский
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Phlogopite, английский
Diamondiferous, английский
Any substance containing diamonds; generally applied to rock or alluvial material containing diamonds but also may be used in referring to other diamond-impregnated substances, such as the crown of a diamond-impregnated bit.
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Lamprophyre, английский
- A group of dark-colored intrusive igneous rocks characterized by a high percentage of mafic minerals (such as biotite mica, hornblende, and pyroxene) as larger crystals, set in a fine-grained groundmass composed of the same minerals plus feldspars or feld s pathoids.
- Dark coloured, very fine- to coarse-grained, basic rock characterised by
Island arc, английский
A curved chain of islands arising from the deep- sea floor that is the volcanic product of subduction.
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