Rare combination of AMAZONITE and SMOKY QUARTZ crystals from the famous SMOKY HAWK MINE in Colorado. Largest Smoky Quartz crystal is 1.5 inches and terminated. Great blue-green color on the Amazonite crystals. Specimen is 7.6 inches in length.
This specimen is from the collection of Bruce Brown (Denver, Colorado).
Location: Smoky Hawk claim, Crystal Peak mining district, Teller County, Colorado, USA
Colorado is well known for its unique combination of amazonite and smoky quartz crystals. The blue-green Amazonite and rich black smoky quartz crystals create an unparalleled contrast making these specimens highly prized among collectors. The Smoky Hawk Mine lies in the northeastern portion of the Lake George intrusive center, which in turn lies on the western ﬂank of the Pikes Peak Batholith. The Pikes Peak granite is a 1.03 billion year old Precambrian granite which extends for over 120 km along the front range of Colorado near Colorado Springs.
AMAZONITE is the blue-green variety of Microcline Feldspar. The color is usually caused by an elevated content of lead. Amazonite is a potassium aluminum silicate mineral. Crystal system is Triclinic. Hardness is 6 – 6.5 on the Mohs scale. Twinning does occur via Carlsbad, Baveno, Manebach, polysynthetic on albite and pericline laws.
SMOKY QUARTZ is the gray to black variety of Quartz that owes its color to gamma irradiation and the presence of traces of aluminum built into its crystal lattice. Smoky quartz can be found in many different environments but is most characteristic for pockets in igneous rocks and pegmatites. Quartz (silicon dioxide) is one of the most common minerals found in the Earth’s crust. Quartz occurs in two basic forms: The more common macrocrystalline quartz is made of visible crystals or grains. Cryptocrystalline quartz or microcrystalline quartz is made of dense and compact aggregates of microscopic quartz crystals and crystallites. Examples are agate, chert and chalcedony. The best known examples of the colored varieties of quartz are amethyst, rose or smoky quartz. There are also names for specific crystal shapes, aggregates and textures, like scepter quartz, gwindel or faden.
Specimen size: 7.6 x 4.9 x 2.0 inches
Specimen weight: 820 grams (1 lb 12.9 ounces)
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