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UV reactivity The small amount of hyalite will react a strong yellow-green color under 395nm UV or 365nm UV light
specimens may stain surfaces or leave residue when handled
in the case of Option F
brittle crust which may make them susceptible to fracturing as part of normal geological processes
Another is tipped with metallic radial growth
Chocolate dogtooth calcite, large Ferruginous quartz UV reactivity The small amountLocale: Santa Eulalia, Chihuahua, Mexico Approx size: 3. 75 x 2. 25 x 2. 25" Approx weight: 485g (about 1 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
