Cobaltian Calcite on Calcite twin, with Malachite - image 1

Cobaltian Calcite on Calcite twin, with Malachite - image 3

Cobaltian Calcite on Calcite twin, with Malachite

$4,000.00

Free shipping
Seller offers an extended return window of up to 30 days
Ships from USA

T

The ArkenstoneFeatured

3,403 for sale·Member since 2026

A stunning geometrical specimen, regardless of species! What we think happened here was that first a normal (and probably colorless) calcite crystal formed, showing typical sharp twinning about the symmetric midsection. Later, the original calcite was either replaced or both replaced and coated by a layer of cobaltian rich calcite. Is it completely replaced inside? Impossible to tell without cutting open, but other similar examples we have seen that were broken, often showed a range of replacement within. Regardless, the outer layer is certainly a later generation of pebbly growth of Co-calcite. The slight cobalt gives the pink coloration. The combination of color and geometry, with little accents of green malachite sheaves, is shocking to the eye and creates a very memorable specimen. One of the most famous pieces in the Pohl collection is a large version of this same material, and it seems like she acquired them in the 1970s by its relatively low number in the collection (49184 out of over 100,000 pieces). Dr. Erika Pohl-Ströher - 49184