Colorless calcite with dusting of red-brown iron Picture jasper I don't know how often

I don't know how often breaks occur due to rough techniques in mining or cracking the geodes open

leaving some hollow between layers

leaving some of the aragonite points hollow

Looking inside the clear quartz of the broken end

Colorless calcite with dusting of red-brown iron Picture jasper I don't know how oftenLocale: 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