Colorless calcite with dusting of red-brown iron Picture jasper It can cause the hydroxyapophyllite

It can cause the hydroxyapophyllite crystals growing over it to glow a faint red—try it in a dark room with a strong flashlight

and can be scratched or broken

leaving some hollow between layers

leaving some of the aragonite points hollow

Many of these specimens are speckled with small pits on the faces

Colorless calcite with dusting of red-brown iron Picture jasper It can cause the hydroxyapophylliteLocale: 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