Matte brown calcite "moonscape" with 'craters' and large crystals Petrified wood When the primary inclusion is

When the primary inclusion is hedenbergite

The heavy base is pyrite

and some pieces have hollow cores

This lumpy piece is half white and half red-brown

The hyalite on this specimen has relatively small spheres

Matte brown calcite "moonscape" with 'craters' and large crystals Petrified wood When the primary inclusion isLocale: Santa Eulalia, Chihuahua, Mexico Approx dimensions: 4 x 2. 25 x 1" Approx weight: 130g This material from Santa Eulalia has rhombohedral calcite crystals on a red brown iron oxide matrix. The 'craters' pockmarking the surface create an unusual moonscape appearanceor maybe more Mars scape with the flat red color of the piece. The crater shapes appear to be the remnants of a crust that had formed over crystals that have since dissolved away.