Both have their edges much rounded, as if, ere their deposition in the conglomerate, they had been long exposed to the wear of the sea; and both are composed of an earthy amygdaloidal trap.
The amygdaloidal traps also occur, and even tuff and breccia, for the materials of these last may be washed down into open fissures at the bottom of the sea, or during eruptions on the land may be showered into them from the air.
Dikes of vesicular and amygdaloidal lava are also seen traversing marine tuff or peperino, west of Palagonia, some of the pores of the lava being empty, while others are filled with carbonate of lime.
It may be traced for many miles, passing through the amygdaloidal and other traps of the hill called Normans Law.
In some of theamygdaloidal traps of Scotland, where the nodules have decomposed, the empty cells are seen to have a glazed or vitreous coating, and in this respect exactly resemble scoriaceous lavas, or the slags of furnaces.
It would seem that extensive amygdaloidal strata formerly extended over these heights, which have been broken down by the fierce and general rush of the oceanic currents of the north, which once manifestly swept over these elevations.
It may be traced for many miles, passing through the amygdaloidal and other traps of the hill called Norman's Law in that parish.
Occasionally we meet with igneous rocks which are more or less vesicular and amygdaloidal throughout their entire mass.
It is often of a porous or vascular texture, and the amygdaloidal cavities are sometimes empty and sometimes contain very delicate stalactites.
In other instances, black and formless masses of porous and amygdaloidal substances are seen scattered about the plains or heaped in conic masses, but having no immediate connection with the strata on which they rest.
In some of the fragments on Mount Napier these cells or pores were several inches in diameter and, unlikeamygdaloidal rocks, all were quite empty.
The ore bodies have the form of long sheets parallel to the bedding, the copper and associated minerals filling amygdaloidal openings and small fissures in the flows, and replacing conglomeratic sediments which lie between the flows.
The openings in rocks consist of joints and many other fractures, small spaces between the grains of rocks (pore space), and amygdaloidal and other openings characteristic of surface volcanic rocks.
The amygdaloidal texture is common in the basic lavas and rare in pumice, simply because the former are more readily decomposed and contain a greater variety of bases from which secondary minerals can be formed.
Thus the vesicular is changed to the amygdaloidal texture, and the lava becomes an amygdaloid (specimen 50).
Amygdaloidal or Concretionary, forming separate globular masses in the enclosing rock.
The amygdaloidal texture is thus necessarily preceded by the vesicular, and is limited to the same classes of rocks.
In India agates occur abundantly in the amygdaloidal varieties of the Deccan and Rajmahal traps, and as pebbles in the detritus derived from these rocks.
Noggerath, as inlets of infiltration, by which the siliceous solutions gained access to the interior of the amygdaloidal cavity.
When they contain spherical cavities, filled with some other mineral, such as chlorite, carbonate of lime or agate, they are calledamygdaloidal trap.
I ascended one, and found it was capped with trap rock in amygdaloidal nodules.
This hill consisted of amygdaloidal trap in nodules, the crevices being filled with crystals of sulphate of lime, and there were many round balls of ironstone, like marbles or round shot, strewed about.
Above Vitina, a mile or two farther up, I found a similar rock but amygdaloidal in character.
My specimens from this locality were unfortunately lost; but in my notes reference is made to the coarsely crystalline grey andesite above noticed, to the later intrusion of a dark amygdaloidal rock, and to an altered calcareous tuff.
About half-way between the village and the hill there occurs in position at the river-side an amygdaloidal basic rock, the amygdules being formed of chalcedonic opal.
Basic agglomerates, containing sometimes amygdaloidal blocks, are displayed in the low district between Valanga and the foot of the range.
Beneath these deposits lies an amygdaloidal augite-andesite which is bared in places.
The scoriaceous and amygdaloidal blocks of the basic agglomerates overlying these tuffs around the base of the mountain have had a similar origin.
I descended by a gentle slope to the north, coarse basic tuffs and agglomerates containing amygdaloidal fragments being displayed on the surface.
Near the mouth of the Narengali valley (see page 149) I found what appears to be a palagonite-tuff overlain by agglomerates formed of tachylytic pitchstone and of semi-vitreous amygdaloidal basalts.
On this north slope of the range I also found an amygdaloidal variety of the same altered rocks containing irregular amygdules, 5 or 6 millimetres long, of fibrous quartz or chalcedony.
In another case, that of an amygdaloidal rock of the same character, the repellent power is 14°.
They comprise the coarse textured dolerite as well as the vitreous pitchstone and include both scoriaceous and amygdaloidal rocks.
In amygdaloidal basaltic rocks it is found at Bishopton in Renfrewshire and near Edinburgh; and as excellent crystallized specimens at several localities in the United States, e.
The amygdaloidal masses contained in the amygdaloid are either entirely pistacite (epidote), or pistacite enclosing calc-spar.
Near the base of this hill, I observed beds of white tuff, intersected by numerous dikes, some of amygdaloidal basalt and others of trachyte; and beds of slaty phonolite with the planes of cleavage directed N.
Here and there masses of highly cellular and amygdaloidallavas protrude.
In the valley of the Marmaraya, a few miles south of the Tapas, a band of trappean and amygdaloidal rock is interposed between a hill of granite and an extensive surrounding formation of red conglomerate, which (like that at the foot of the S.
This bole is a very common mineral in the amygdaloidal rocks; it is generally of a greenish- brown colour, with a radiating structure; externally it is black with an almost metallic lustre, but often coated by a bright green film.
One of the commonest stratified porphyries is of a green colour, highly amygdaloidal with the various minerals described in the preliminary discussion, and including fine tabular crystals of albite.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "amygdaloidal" in a variety of sentences. We hope that you will now be able to make sentences using this word.
