7.8" Polished Agate and Amethyst Geode "Egg" - Madagascar

 
 
 
This is a beautiful 7.8" tall polished egg, made from a banded agate and quartz encrusted geode. This mineral egg was mined, shaped and hand polished in Madagascar. The banded agate displays a variety of colors ranging from white to red and the cavity within this geode is lined with quartz crystals. The quartz within the cavity appears to have some purple coloration, however not enough to confidently consider it to be amethyst. The yellow coloration of the quartz around the exterior of the egg can likely be attributed to iron oxidation.

Comes with the pictured display stand.

Agate is a variety of microcrystalline quartz that displays translucence and in some cases banding. Agate primarily forms when silica-rich fluids fill pockets within rock and/or fossils, resulting in deposition of the silica along the walls of the rock. This process can result in banding patterns as the composition and impurities of the fluids change over time. These banding patterns can either form as flat layers or rounded layers, depending on the surfaces available for deposition.

Silicon Dioxide, also know as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.
DETAILS
SPECIES
Chalcedony var. Agate & Quartz
LOCATION
Madagascar
SIZE
7.8 x 5.8"
SUB CATEGORY
ITEM
#117266