Calcite

This thumbnail specimen features a single, well-formed calcite crystal from the Grant Quarry in Ontario. The crystal is sharp and transparent to translucent, with smooth, lustrous faces and a short terminated tip. The specimen has marcasite inclusions, visible as faint metallic sparkles within the crystal, hinting at the complex geochemistry of the quarry environment. A fine and representative example from this classic Ottawa-area locality, known for its diverse and well-crystallized calcite specimens.