LOCALE — Pantano, Camarillas, Agramon, Spain, Europe

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Menilite is a concretion of silica and calcium carbonate often considered a variety of opal. It forms in nodules of shale and gypsum, which produces these smooth, abstract concretions. You will find tiny shells and fossils embedded in these chalky forms.

Menilite was named in 1795 after the Parisian neighborhood of Ménilmontant where it was first described by the French geologist Jean-Claude Delamétherie.

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DETAILS

A
S — 2.375 × 2 × 0.75
W — 57.8 grams

B
S—2.75 × 2.5 × 1
W—71 grams