Chocolate dogtooth calcite, large Dragon's Blood Jasper or knobby "ear" with raised

or knobby "ear" with raised rims of concentric banding

which appears matte but glitters under direct light

so they appear dark gray until you look closer and see swirls of red and lime green

Where points have broken

blends into white and brown aragonite

Chocolate dogtooth calcite, large Dragon's Blood Jasper or knobby "ear" with raisedLocale: 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