Chocolate dogtooth calcite, small Sandstone Approx dimensions: 2 x 1

Approx dimensions: 2 x 1

but faces are inset with raised edges

Approx weight: 12–20g (Option A about 30g)

On other specimens the purple ends appear to have cubic forms

they are concretions formed out of beautiful tones of red sandstone material

Chocolate dogtooth calcite, small Sandstone Approx dimensions: 2 x 1Locale: Santa Eulalia, Chihuahua, Mexico Approx size: 22. 5" Approx weight: 45120g 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 growth.