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G - 7 x 6 x 3"
The near-black botryoidal mass is an aggregate of spheres with radial structure inside
These pieces can be fascinating to study up-close
There are quite a few colors and varieties of picture jasper
Prehnite and epidote commonly grow together because they have similar chemical requirements (both need calcium and aluminum
Chocolate dogtooth calcite, large Wulfenite G - 7 x 6Locale: 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
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