3.4" Vibrant, Polished Gem Silica Specimen - Rare!

Here is a phenomenally vibrant 3.4" wide cut of gem silica. This agate-like chalcedony and chrysocolla association is one of the most the highly sought after materials for polishing and gem making. This specimen is particularly interesting because it shows the full range of colors for chrysocolla and has massive amounts of fibrous malachite inclusions. It is a truly special piece and it is extremely rare to find at this level of impeccable quality.

Comes with an acrylic display stand.

Chrysocolla is a basic copper silicate that typically forms as a pseudomorph following other copper based minerals. The chemical formula is considered undetermined due to the varying substitutions of elements and water content in its chemical structure. However, there is a form of chrysocolla with an identifiable chemical formula of Cu2H2Si2O5(OH)4, that can be found in microcrystals.

Regularly, chrysocolla will form as botryoidal lumps and spheres, rarely forming visible crystals. It's also been known to form in both solid and fibrous veins, over fibrous minerals and in crusts. Known for its sharp and vibrant coloring, chrysocolla can display a wide variety of colors such as blueish-green, bright green, light blue to even sometimes multicolored specimens, depending on the atmosphere present during formation.

Chalcedony is any microcrystalline variety of silica composed of very fine intergrowths of quartz and moganite. Microcrystalline meaning the crystals are microscopic and cannot be observed by the naked eye. Both quartz and moganite have the same chemical formula SiO2 (silicon dioxide) but different crystal structures. When free from impurities, chalcedony is colorless and transparent. Dependent on impurities present during formation, chalcedony can form in a wide variety of colors including red, yellow, green, blue, purple, grey, white and numerous color hues in between. Chalcedony is quite hard, being a 7 on the Mohs Hardness Scale, which makes sense considering quartz is the benchmark mineral for a 7.
FOR SALE
DETAILS
SPECIES
Quartz var. Chalcedony, Chrysocolla & Malachite
LOCATION
Inspiration Mine, Inspiration, Gila County, Arizona
SIZE
3.4 x 2.9", up to 1.1" thick
CATEGORY
ITEM
#191879