Chocolate dogtooth calcite, large Petrified wood The small dark spheres included

The small dark spheres included inside the crystal and dotting the surface may be goethite or hedenbergite

The calcite has also formed stacks of small scalenohedral crystals

The galena has formed a small flat square tabular crystal coated in overgrowth

This specimen is a great example of that

Microcline is a type of feldspar that forms sculptural blocky crystals

Chocolate dogtooth calcite, large Petrified wood The small dark spheres includedLocale: Santa Eulalia, Chihuahua, Mexico Approx size: 5 x 3 x 1. 75" Approx weight: 372g 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 dark brown appearance from iron oxides; a layer of hematite included calcite is deposited on the surface during a later phase of