amygdaloidal


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Related to amygdaloidal: trachytic, spherulitic, Amygdules
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Synonyms for amygdaloidal

shaped like an almond

References in periodicals archive ?
Amygdaloidal or drop-shaped mounds on the lower surface of sandstone beds, which are 16-27 mm wide and 27-60 mm long, pointed on one side (drop-shaped) or both sides.
(3.) Amygdaloidal basalt has the strength of 600 kg/sq.cm, offers ease of dressing, is non-porous, has vesicles that are not interconnected and is free from divisional planes.
Within the pockets of the lower and middle amygdaloidal horizons, quartz, datolite and albite have covered glauberite, leaving behind rectangular epimorphs as hollow shells.
Newly studied zeolite specimens come from two places, both lying immediately below the road Bfeziny-Dobrna: (1) the upper locality is represented by exposures in the upper part of the incised lava flow (vesicular and amygdaloidal facies) and (2) the lower locality near the building at an abandoned dam (both vesicular and massive varieties) represents the lower part of the same lava flow, however, subjected to landsliding.
In an amygdaloidal basalt flow 4 miles southwest of Houghton, Michigan, H.
Two lenticular bodies of porphyritic and amygdaloidal basalt are found intercalated within the Hyaloclastite mudstone units of the Bagh complex (Siddiqui et al., 1996).
It is disconformably overlain by the Ludlovian Bryant Point Formation, which is composed of greyish-green to maroon, locally highly porphyritic and amygdaloidal basaltic flows with plagioclase phenocrysts up to 3 cm in length.
The lowermost 8 meters of the basalt contain four types of mineralized structures: (1) pillow lava, (2) scoria (3) amygdaloidal basalt and (4) veins.
The bedrock of the profile U-II is a marginal analcime-phyric facies of the phonolite laccolith that grades into amygdaloidal natrolite-sodalite phonolite in the laccolith centre.
The study area is geologically covered by Deccan trap rocks from the Cretaceous to the lower Eocene age, consisting of amygdaloidal and vesicular basalts.
Figures 5a and 5b show a typical prehnite-pumpellyite subfacies assemblage in amygdaloidal basalt.
In 1982, dachiardite-Na was found in the alcove on the upper level in what appear to be amygdaloidal basaltic sills (A.