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Macrodiamond
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
A rough diamond that is more than 0.5 mm in diameter.
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Mantle keel, английский
The downward-protruding, thickened portion of the lithospheric mantle that resides under the continen- tal crust of the craton, and which has had an extended pe- riod of attachment to the craton.
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
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