Phenocryst Pyramid (Basalt and Olivine ) Avg 73-73mm Base and 60mm height $25ea Three Available
Non-returnable
Phenocryst is a basalt rock specimen featuring small olivine phenocrysts—olivine crystals embedded in a fine-grained matrix. It forms from slow cooling of magma, allowing olivine to crystallize first. This texture indicates a two-stage cooling process typical of volcanic environments.
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