amygdaloid

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Related to amygdaloids: amygdala
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Synonyms for amygdaloid

volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits

Related Words

shaped like an almond

References in periodicals archive ?
Quartz, datolite, prehnite and albite are found as pseudomorphs after anhydrite within zones 3 and 4 of the lower and middle amygdaloids.
It is distributed throughout the amygdaloids starting near the bottom of zone 4 and continuing upward into zone 1.
Chalcopyrite is found throughout zones 3 and 4 of the lower and middle amygdaloids as brassy sphenoidal crystals up to 1 cm on datolite, prehnite, albite and heulandite.
Datolite is plentiful in the amygdaloids from the middle of zone 3 downward through zone 4.
Prehnite occurs in the amygdaloids distributed between the top of zone 4 and the upper part of zone 3.
It was in this mine that the great amygdaloid vein was found, and this type of formation was the foundation for the amazing production record of the Quincy as well.