Rich group of pyrite crystals, isolated and disposed in the original marl matrix. Exceptional luster and some of them show flattened prismatic shapes. From a classic mine for the Spanish mineralogy. Good size specimen.

Pyrite cluster formed by some interpenetrated crystals, with marked striated cube faces and pyritohedron. Faces and edges have a characteristic curvature. Excellent brilliance. These are specimens with more than two decades from this classic pyrite Spanish mine.

This good sized pyrite specimen shows us several interpenetrated crystals, two of them dominant, with marked striated cube faces and pyritohedron. Faces and edges have a characteristic curvature. Excellent brilliance. Only two small corners are dinged. These are specimens with more than two decades from this classic pyrite Spanish mine.

This good sized pyrite specimen shows us several interpenetrated crystals, one of them dominant, with marked striated cube faces and pyritohedron. Faces and edges have a characteristic curvature. Excellent brilliance. Only one small corner is dinged. These are specimens with more than two decades from this classic pyrite Spanish mine.

This pyrite specimen shows us several interpenetrated crystals, one of them dominant, with marked striated cube faces and pyritohedron. Faces and edges have a characteristic curvature. Excellent brilliance. These are specimens with more than two decades from this classic pyrite Spanish mine.

These old specimens of pyrite belong to one of those curiosities that Nature offers us. In these pieces we can see crystals those are showing no apparent cubic symmetry. They have, more or less marked, parallelepiped forms unusually flattened. The edges are completely natural and the crystal has been consolidated on its matrix to avoid its possible detachment.
This kind of crystals put into question certain aspects of the cubic symmetry of pyrite. For more information on this topic you can read articles like King & Prewitt 1979 (Amer. Min., 64, 1265-1271).

These old specimens of pyrite belong to one of those curiosities that Nature offers us. In these pieces we can see crystals those are showing no apparent cubic symmetry. They have, more or less marked, parallelepiped forms unusually flattened. The edges are completely natural and the crystal has been consolidated on its matrix to avoid its possible detachment.
This kind of crystals put into question certain aspects of the cubic symmetry of pyrite. For more information on this topic you can read articles like King & Prewitt 1979 (Amer. Min., 64, 1265-1271).

These old specimens of pyrite belong to one of those curiosities that Nature offers us. In these pieces we can see crystals those are showing no apparent cubic symmetry. They have, more or less marked, parallelepiped forms unusually flattened. The edges are completely natural and the crystal has been consolidated on its matrix to avoid its possible detachment.
This kind of crystals put into question certain aspects of the cubic symmetry of pyrite. For more information on this topic you can read articles like King & Prewitt 1979 (Amer. Min., 64, 1265-1271).

Group of interpenetrated pyritohedrons on matrix from a classic Spanish locality as Ambasaguas. Very sharp faces and edges, intense golden color and excellent luster. The perfection of the Rioja pyrites.