Lamproite is an ultrapotassic mantle-derived volcanic or subvolcanic rock. It has low CaO, Al2O3, Na2O, high K2O/Al2O3, a relatively high MgO content...

prominent lamproite diamond source is the Argyle diamond mine in Australia. It is notable that the physical characteristics of Australian lamproite and the...

largely composed of one of two characteristic rock types — kimberlite or lamproite. These rocks reflect the composition of the volcanoes' deep magma sources...

kimberlite and lamproite occurrences occur as volcanic and subvolcanic diatremes and maars; lavas are virtually unknown. Vents of Proterozoic lamproite (Argyle...

a volcanic pipe of lamproite, rather than the more usual kimberlite pipe; much earlier attempts to mine diamonds from a lamproite pipe in Arkansas, United...

subcontinental mantle by examining mantle xenoliths brought up in kimberlite, lamproite, and other volcanic pipes. The histories of these xenoliths have been...

Big Hole. Previously, the term kimberlite has been applied to olivine lamproites as Kimberlite II, however this has been in error. Kimberlite occurs in...

volcanic eruptions and deposited in igneous rocks known as kimberlites and lamproites. Synthetic diamonds can be grown from high-purity carbon under high pressures...

Helenite (artificial glass made from volcanic ash) Iddingsite Kimberlite Lamproite Lapis lazuli Libyan desert glass Llanite Maw sit sit Moldavite Obsidian...

inclusions in diamonds, xenoliths, and such other ultramafic rock such as lamproite. Analysis of silicon carbide grains found in the Murchison meteorite has...

type of volcanic rock. Specifically, it is a diopside-leucite phlogopite lamproite. It is a potassium enriched, alkaline, basic, phonolite first found in...

which sometimes contains diamonds Komatiite – Magnesium-rich igneous rock Lamproite – Mantle rock expulsed to the surface in volcanic pipes Lamprophyre –...

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...

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,...

phase within ultrapotassic igneous rocks such as lamprophyre, kimberlite, lamproite, and other deeply sourced ultramafic or high-magnesian melts. In this...

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...

found in 1725. Diamond production of primary deposits (kimberlites and lamproites) only started in the 1870s after the discovery of the diamond fields in...

been reduced by glacial and subaerial erosion. The volcano has produced lamproite magmas, and is the youngest volcano to have produced such magmas on Earth...

with richterite and serpentinitized olivine of mafic xenoliths in the lamproite host rock. It is an iron(II) rich member of the magnetoplumbite group...

cools and solidifies, it forms unusual potassic rock such as lamprophyre, lamproite, or kimberlite. When enough rock is melted, the small globules of melt...

composition of the otherwise inaccessible mantle. Basalts, kimberlites, lamproites and lamprophyres, which have their source in the upper mantle, often contain...

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...

contains 120 out of the 150 kimberlite pipes in India. Though kimberlite and lamproite are the primary rock source, conglomerate and placers had yielded the...

in extrusive igneous rocks, particularly those such as kimberlites and lamproites that have deep mantle sources. Anatase and brookite are found in the igneous...

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...

for several years, no diamonds of commercial interest have been found. Lamproite Elliott County Kimberlite Cannon, W., Murdrey, M. (1981) "The Potential...

deposits; Rare-metal pegmatites; Diamond deposits in kimberlites and lamproites. Kilinc, Attila (1989-12-01). "Partial melting of crustal rocks". Engineering...

centre hydrothermal fields. the presence of diamond within kimberlites and lamproites which sample the mantle depths proposed as being the source region of...

igneous rock with high silica contents. Most commonly it is found with Lamproite. Potassic-magnesio-fluoro-arfvedsonite is a uniquely rare mineral, as...

genesis. Lamprophyres are similar to lamproites and kimberlites. While modern concepts see orangeites, lamproites and kimberlites as separate, a vast majority...