Another was made of hornblende-hypersthene andesite belonging to the ortho-phyric order of that sub-class (see page 299).
This rock is described under the second order of the hornblende-hypersthene andesites on page 299.
A pale green augite is common in these andesites, but bronzite or hypersthene is comparatively rare.
The hyperstheneis nearly always idiomorphic, with a distinct pleochroism ranging from salmon-pink to green.
The Adirondack Mountains in the State of New York are referred to the same series, and it is conjectured that the hypersthene rocks of Skye, which resemble this formation in mineral character, may be of the same geological age.
Hornblende, which we have observed to be an important and rather constant constituent of diorite and syenite, is much less abundant in norite; but its place is taken by augite and the allied minerals, hypersthene and enstatite.
The name gabbro is sometimes applied to the coarser and more feldspathic diabases, and especially to those containing diallage or hypersthene in the place of common augite.
In some gabbros and norites reaction rims of fibrous hornblende are found around both hypersthene and diallage where these are in contact with felspar.
The cleavage surfaces therefore exhibit a metallic sheen or "schiller," which is even more pronounced in hypersthene than in bronzite.
The labradorite and hypersthene rocks from that island are identical with those of the Labrador series in Canada and New York, and unlike those of any formation at any other known horizon.
Every variety of igneous rock, from light porous pumice to dense metallic green-black hypersthene andesite, may be picked up in the bed of this stream.
This petrographical study showed that "Mount Rainier is formed almost wholly of hypersthene andesite, with different conditions of groundmass and accompanied by hornblende and olivine in places.
The glassy rock has hypersthene as the predominant phenocryst, while feldspar is the more important in the compact and more crystalline andesite.
Both are light colored, and the pleochroism of the hypersthene is sometimes quite faint.
As was noted by Hague and Iddings, the hypersthene and olivine play a like role, the former occurring when the silica percentage is somewhat higher than in basalt.
The hypersthene is usually more perfectly idiomorphic and occurs in long prisms, with the pinacoidal planes best developed, while the augite is in stout prisms, usually twinned.
Hypersthene is not the prevailing pyroxene, and olivine is usually present, often in such abundance as to make the rock a basalt.
In Moraine Park gray andesites also predominate, with both pyroxenes as phenocrysts, but herehypersthene is the more important.
On Crater Peak, and below on Gibraltar, hyperstheneandesite occurs with considerable variation of color and texture.
Hypersthene and augite occur alone or together, and are readily distinguished by their different crystallographic habits as well as by their optical properties.
Some geologists consider it a greenstone, in which hypersthene replaces hornblende.
There is a rock of crystalline structure, like granite, but of a darker color, which is called hypersthene rock.
The unstratified rocks are Granite, Hypersthene rock, Limestone and Serpentine, and the Trappean and Volcanic rocks.
Hypersthene rock, in a few cases, forms the principal part of mountain masses.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "hypersthene" in a variety of sentences. We hope that you will now be able to make sentences using this word.
