Calcite

3rd Cave west of Kilninian, Reudle, Isle of Mull, Scotland

Reference: 2400

Interesting specimen from the Isle of Mull, a location not as well known for specimens compared to the nearby Isle of Skye. Wonderful provenance from the Gordon Todd collection as to the sea cave in which it was found. The specimen has two distinct phases of calcite mineralisation in-between which a layer of small delicate stilbite crystals have been deposited.

Formulas: Calcite CaCO₃; Stilbite (Ca_0.5,K,Na)₉(Al₉Si₂₇)O₇₂ ^. 28H₂O