Chocolate dogtooth calcite, large Wulfenite These pieces can be fascinating

These pieces can be fascinating to study up-close

Note: I was able to remove the chip of matrix between the two larger formations (apparent in images 1 and 3) so it is less distracting from the aesthetics of the piece

This is a great "hodgepodge" specimen

Prehnite and epidote commonly grow together because they have similar chemical requirements (both need calcium and aluminum

Chocolate dogtooth calcite, large Wulfenite These pieces can be fascinatingLocale: Santa Eulalia, Chihuahua, Mexico Approx size: 4 x 3 x 2. 5" Approx weight: 652g (about 1 1 3 lb) Known by the trade name "chocolate dogtooth calcite," this type of calcite from the famed Santa Eulalia mining district grows in hedgehog clusters of sharp dogtooth (scalenohedral) crystals. The variety gets its distinctive opaque brown appearance from iron oxides; a layer of hematite included calcite is deposited on the surface during a later