Lamproite is an ultrapotassic mantle-derived volcanic or subvolcanic rock. It has low CaO, Al2O3, Na2O, high K2O/Al2O3, a relatively high MgO content... 11 KB (1,074 words) - 04:24, 4 January 2024 |
Volcanic pipe (section Lamproite pipes) largely composed of one of two characteristic rock types — kimberlite or lamproite. These rocks reflect the composition of the volcanoes' deep magma sources... 4 KB (488 words) - 02:04, 16 March 2024 |
Kimberlite (section Olivine lamproites) Big Hole. Previously, the term kimberlite has been applied to olivine lamproites as Kimberlite II, however this has been in error. Kimberlite occurs in... 31 KB (3,586 words) - 07:16, 22 April 2024 |
Helenite (artificial glass made from volcanic ash) Iddingsite Kimberlite Lamproite Lapis lazuli Libyan desert glass Llanite Maw sit sit Moldavite Obsidian... 13 KB (866 words) - 05:32, 11 March 2024 |
type of volcanic rock. Specifically, it is a diopside-leucite phlogopite lamproite. It is a potassium enriched, alkaline, basic, phonolite first found in... 2 KB (228 words) - 03:18, 9 June 2022 |
which sometimes contains diamonds Komatiite – Magnesium-rich igneous rock Lamproite – Mantle rock expulsed to the surface in volcanic pipes Lamprophyre –... 14 KB (2,211 words) - 23:33, 16 April 2024 |
the town of Panna, Madhya Pradesh. The deposit is in a kimberlite or lamproite pipe 6.5 ha in area, and yields 10 carats to the ton. Mining is done by... 9 KB (1,188 words) - 02:07, 16 March 2024 |
resistant volcanic neck which is composed of the uncommon volcanic rock lamproite. Rock samples from Boars Tusk provided an age of 2.5 MA. "Boars Tusk,... 3 KB (239 words) - 07:58, 16 January 2024 |
phase within ultrapotassic igneous rocks such as lamprophyre, kimberlite, lamproite, and other deeply sourced ultramafic or high-magnesian melts. In this... 7 KB (631 words) - 21:00, 9 January 2024 |
The Ellendale Diamond Field is a cluster of lamproite intrusions located 125 km ESE of Derby within the WNW trending Lennard Shelf to the south of the... 11 KB (1,217 words) - 09:32, 16 April 2024 |
with richterite and serpentinitized olivine of mafic xenoliths in the lamproite host rock. It is an iron(II) rich member of the magnetoplumbite group... 3 KB (168 words) - 04:34, 1 February 2023 |
in the northern Gulf of Mexico Basin starting with the Prairie Creek lamproite (110 Ma) in the west to the Magnet Cove (105 Ma), Granite Mountain (90... 8 KB (773 words) - 03:49, 22 November 2023 |
11 and 17 missions. It was later identified on Earth from samples of lamproite dikes and plugs taken in Smoky Butte, Garfield County, Montana, US. On... 15 KB (1,595 words) - 19:02, 14 January 2024 |
for several years, no diamonds of commercial interest have been found. Lamproite Elliott County Kimberlite Cannon, W., Murdrey, M. (1981) "The Potential... 2 KB (321 words) - 12:50, 15 June 2021 |
deposits; Rare-metal pegmatites; Diamond deposits in kimberlites and lamproites. Kilinc, Attila (1989-12-01). "Partial melting of crustal rocks". Engineering... 18 KB (1,854 words) - 15:10, 4 April 2024 |
centre hydrothermal fields. the presence of diamond within kimberlites and lamproites which sample the mantle depths proposed as being the source region of... 70 KB (7,714 words) - 06:21, 21 April 2024 |
igneous rock with high silica contents. Most commonly it is found with Lamproite. Potassic-magnesio-fluoro-arfvedsonite is a uniquely rare mineral, as... 5 KB (520 words) - 20:30, 22 December 2023 |