Prehnite cast after Calcite (uncommon old locale)

Item Description

Prehnite specimens are uncommon from this obscure South African locale. This thin crust with elevated areas along the edges is composed of frosted, translucent, pretty mint-green, bladed crystal aggregates that formed as casts after calcite rhombs. The upright clusters really accentuate this showy piece. Pristine. The piece has a very flat base, indicating that the specimen grew against a large sharp crystal. Excellent material.