amygdaloids background

amygdaloids

/əˈmɪɡdəlɔɪdz/

Illustration amygdaloids - Image 1

noun

Amygdaloïdes

A variety of trap or basaltic rock, containing small cavities, occupied, wholly or in part, by nodules or geodes of different minerals, especially agates, quartz, calcite, and the zeolites. When the imbedded minerals are detached or removed by decomposition, it is porous, like lava.

Examples :

"The old volcanic flow, now visible as a weathered cliff face, was identified as amygdaloids due to the numerous cavities filled with sparkly quartz crystals. "

L'ancien écoulement volcanique, maintenant visible sous la forme d'une falaise érodée, a été identifié comme des amygdaloïdes en raison des nombreuses cavités remplies de cristaux de quartz scintillants.

geology mineral material