This has, by and large, dispensed with the previous provincial names of lamprophyre species, in favor of a mineralogical name.
22.
Typically they occur as sills, often in association with nepheline syenite; and they seem to bear a complementary relationship to certain types of lamprophyre dikes.
23.
The Beemerville Alkaline Complex also includes several lamprophyric diatremes that contain xenoliths of sedimentary rocks and gneiss and autoliths of carbonatite, potassic syenite, and lamprophyre micromelteigite.
24.
This suggests the sapphire crystals may have originated in an earlier rock, such as a corundum-bearing gneiss, later assimilated by the lamprophyre magma at depth.
25.
Typically, primitive melts of this composition form lamprophyre, lamproite, kimberlite and sometimes nepheline-bearing mafic rocks such as alkali basalts and essexite gabbros or even carbonatite.
26.
Vents of Proterozoic lamproite ( Argyle diamond mine ), and Cenozoic lamproite ( Gaussberg, Antarctica ) are known, as are vents of Devonian lamprophyre ( Scotland ).
27.
Between the Beemerville alkaline complex and the Cortlandt igneous complex, this magmatic belt consists of a linear, almost east-west trending, zone of lamprophyre and felsic dikes.
28.
The Yogo sapphires themselves are rimmed with a reaction layer of spinel and are etched, indicating that the sapphires were not in chemical equilibrium with their host, the lamprophyre magma.
29.
The mountain face's diagonal hand-holds of ferrodiorite and vertical dikes of lamprophyre have contributed to more than 50 rock climbing routes with such intriguingly whimsical names as Fastest Gun, Bloody Mary and Gamesmanship.
30.
The most famous of the rocks of Aln�n is the " alnoite ", named from the Island, which is a lamprophyre chiefly composed of biotite or phlogopite and melilite as essential minerals, commonly with olivine, calcite and clinopyroxene.
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