Colorless calcite with dusting of red-brown iron Aquamarine Specimens including this one feature

Specimens including this one feature unusual "tutus" of quartz or chalcedony growth on some of the spires—in this case it has curiously taken on a square shape and banded agate appearance

This calcite specimen from Santa Eulalia is a lovely deep red color from hematite (iron oxide) inclusions

Ripples and flow patterns indicate water was involved in the deposition of the brown sandy-textured layered crust

with more irregular stepped ends on the striations of the main crystals

Colorless calcite with dusting of red-brown iron Aquamarine Specimens including this one featureLocale: Santa Eulalia, Chihuahua, Mexico Approx dimensions: 4 x 3 x 1. 25" Approx weight: 388g This calcite specimen from Santa Eulalia has a layer of calcite druzy with several larger modified rhombohedral calcite crystals perched atop. The druzy is well formed, composed of interlocking calcite crystals. The piece appears finely dusted with cinnamon brown color: this is hematite which causes the red and brown coloration of the mineral. UV reactivity