After the cone was eroded, a series of hypersthene andesite lava flows were erupted between 0.17 and 0.21 million years ago.
12.
"' Bronzite "'is a member of the pyroxene group of minerals, belonging with enstatite and hypersthene to the cleavage surfaces.
13.
"' Hypersthene "'is a common rock-forming igneous and some metamorphic rocks as well as in stony and iron meteorites.
14.
Component chemicals found at Lascar include : anorthite, augite bordering on diopside, bronzite, fassaite, forsterite, hypersthene, pigeonite, and more.
15.
"' Baltimore Gabbro Complex "'is a hypersthene gabbro with subordinate amounts of olivine gabbro, norite, anorthositic gabbro, and pyroxenite.
16.
Hydrofluoric acid attacks feldspar before quartz and, if used cautiously, dissolves these and any glassy material in a rock powder before it dissolves augite or hypersthene.
17.
Pure enstatite contains no iron, while pure ferrosillite contains no magnesium; hypersthene is the name given to the mineral when a significant amount of both elements are present.
18.
Renewed volcanism between 210, 000 and 170, 000 years ago produced hypersthene andesite lava flows, which locally terminate with precipitous } } thick ice-contact margins.
19.
Distinctly developed crystals are rare, the mineral being usually found as foliated masses embedded in the igneous rocks norite and hypersthene-andesite, of which it forms an essential constituent.
20.
Leucite is very rare in plutonic masses; many minerals have special peculiarities in microscopic character according to whether they crystallized in depth or near the surface, e . g ., hypersthene, orthoclase, quartz.
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