The minerals of diabase are the same as those of dolerite, viz.
In the eastern Thuringian Fichtelgebirge the upper division is represented by Clymenia limestone and Cypridina slates with Adorf limestone, diabase and Planschwitzer tuff in the lower part.
In west central Europe volcanic rocks are found at many horizons, the most common rocks are diabases and diabase tuffs, schalstein.
The terms diabase and dolerite are employed really to designate distinct facies of the same set of rocks.
She was not one who would sink down into inaction at the sudden onset of terror.
Not long after reaching the Falcon the sailors were summoned to the side which looked toward the spot where the ship had sunk, and the solemn voice of Brandon read the burial-service of the Church.
Your foul aspersions upon my character are unworthy of notice.
These are caused either by old intrusions of diabase and gabbro which have undergone modifications, or by later ones of dolerite.
It is traversed in places by dikes and sills of diabase or dolerite, while bosses of more or less altered gabbro rise through it.
The gold of the placer deposits appears to be derived, not from quartz reefs, but from the schists and intrusive rocks, the selvages of the diabasedikes sometimes containing as much as 5 oz.
The igneous rocks are commonly acid intrusives of a granite or porphyry type, less commonly intrusives of gabbro and diabase and surface lavas of rhyolite and basalt.
In Arizona chrysotile is found in veins in cherty limestone, associated with diabase intrusives.
The ores are found in numerous short, narrow veins, principally in pre-Cambrian sediments near a thick quartz-diabase sill.
Some investigators of these ores believe them to have been introduced into the conglomerate and sand by later solutions, possibly by hot solutions related to certain diabaseintrusions that cut the beds.
Defn: A kind of diorite or diabase containing imbedded whitish spherules, which give the rock a spotted appearance.
Defn: A greenish spotted porphyry, being a diabase whose pyroxene has been altered to uralite; -- first found in the Pyreness.
A greenish spotted porphyry, being a diabase whose pyroxene has been altered to uralite; -- first found in the Pyreness.
A kind of diorite or diabase containing imbedded whitish spherules, which give the rock a spotted appearance.
Dynamic alteration of the Catoctin diabase is pronounced and wide-spread.
They are holocrystalline in form and true glassy bases are rare, rendering the term diabasemore appropriate than basalt.
The diabase occurs only as an intrusive rock in the vicinity of the Catoctin Belt.
Description of the lithified deposits would be far from complete without reference to the later diabase which is associated with the Newark rocks.
In the Piedmont areas small rounded diabasefragments occur on the surface.
In view of the fact, however, that most of the formation has a well defined schistosity destroying its diabasic characters, and now is not a diabase but a schist, it seems advisable to speak of it as a schist.
None the less, its origin as diabase can definitely be asserted of the whole mass.
At Leesburg the limestone conglomerate next the diabase is indurated, its iron oxide is driven off, and the limestone partly crystallized into marble.
Numerous rounded diabase bowlders, varying in size from a few inches to several feet in diameter, are also scattered over the surface of the soil.
The diabase of the Newark areas is almost exclusively confined to the red sandstone, and the dike at Leesburg cutting the limestone conglomerate is almost the only occurrence of that combination.
The granite in the southern portion of the County is very important in point of extent, almost as much so as the diabase in the same section.
While the diabase dikes are most prominent in the Newark rocks, they are also found occasionally in the other terraces.
The diabase dikes in the Catoctin Belt are always narrow, and, while many outcrops occur along a given line, it is probable that they are not continuous.
Quartz porphyry, diabase and diorite appear in the Ardennes.
Diabase is one of the rocks which decay most readily; while granite is, among common rocks, one of those that resist decay most effectually.
By referring to the classification it will be seen that diabase occupies the same position among the dike rocks as norite among the stratified rocks.
In consequence of their more basic composition, diabase and diorite are usually strongly contrasted with granite and syenite in color and specific gravity, being darker and heavier.
The principal accessories in diabase are biotite, chlorite, magnetite, pyrite, calcite, and olivine.
The rock bearing this familiar name represents diabaseamong the dike rocks.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "diabase" in a variety of sentences. We hope that you will now be able to make sentences using this word.
