amygdaloidal

Many of the lava flows are characterized by amygdaloidal zones.

Slaggy, amygdaloidal flows - where mineralization is generally found - are not uncommon.

Rocks containing amygdules can be described as amygdaloidal.

The lower (Ashangi group) consists of basalts and dolerites often amygdaloidal.

Near a basalt mountain at Gelenberg, an amygdaloidal layer was found in the greywacke.

The metabasalt is predominantly amygdaloidal and contains secondary minerals typical of greenschist-facies metamorphism.

Natrolite occurs with other zeolites in the amygdaloidal cavities of basaltic igneous rocks.

As the lava solidified, gas trapped within the flows formed an amygdaloidal texture (literally, rock filled with small vesicles).

These vesicles are often infilled by minerals (especially zeolites) and/or weathering products from the lava to form an amygdaloidal texture.

At Haco's Ness in the south east corner of the island is a small outcrop of amygdaloidal diabase.

Zeolites occur in amygdaloidal basalt flows and constitute up to 20 weight percent of the rock in zones up to 10 m thick.

Amygdaloidal structure is common in relict vesicles and beautifully crystallized species of zeolites, quartz or calcite are frequently found.

Amygdaloidal felsic lavas overlie the mafic flows and are locally capped by coarse explosion breccia.

It occurs in the amygdaloidal cavities of basaltic volcanic rocks, in andesites, gneiss and hydrothermal veins.

The agates of Amygdaloid Island are characteristically almond-shaped or amygdaloidal, hence the name Amygdaloid.

Like other zeolites, mesolite occurs as void fillings in amygdaloidal basalt also in andesites and hydrothermal veins.

Its technical name (biface) comes from the fact that the archetypical model is a generally bifacial Lithic flake with an almond-shaped (amygdaloidal) morphology.

The composite dam is founded in area with geological formations of amygdaloidal basalt, porphyritic basalt, dolerite, and agglomerate.

Pumpellyite occurs as amygdaloidal and fracture fillings in basaltic and gabbroic rocks in metamorphic terranes.

Near Haco's Ness in Shapinsay there is a small exposure of amygdaloidal diabase, which is older than that on Hoy.

The seven hills are in the geological formation of the Deccan Trap comprising hard and amygdaloidal basalts, bole beds (red bole) and lateritic soils.

Here, glacially scoured, vertical cliffs, some more than 100 m high, are formed of 1.1 Ga middle Keweenawan basaltic lava flows displaying ophitic interiors and red amygdaloidal tops.

Development-Stage Projects C2C Mining Corporation continued evaluation of the zeolite potential of amygdaloidal basalts along the North Mountain in western Nova Scotia.

Agate Creek in far North Queensland is the acknowledged Australian source for attractively patterned agates that occur in and are weathered from amygdaloidal basalt of Carboniferous age.