Nail Head Calcite | Tri-State Barite deep-green malachite with the classic

deep-green malachite with the classic “velvet” texture for which Congo malachite is renowned

It is also widely known as "fool's gold" for its uncanny resemblance

5” and weighs 22

Outside fluoresces a red and white

This polished specimen displays an ancient algal colony fossil from the Pennsylvanian Period (approximately 323–299 million years ago)

Nail Head Calcite | Tri-State Barite deep-green malachite with the classicThis specimen features sharp, golden nail head calcite crystals from the historic Tri State mining district of Missouri, Kansas, and Oklahoma. The distinctive flattened crystal habit gives the appearance of nail heads, a signature form from this region. Under ultraviolet light, the calcite fluoresces, adding an extra dimension to its natural beauty. A fine example of classic Tri State mineralogy and vintage American mining heritage. This item is 3. 25