19.5" Free-Standing, Polished Ocean Jasper (139.6 lbs) - Madagascar

 
 
 
 
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This is a massive, polished free standing freeform made of ocean jasper from the Ambolobozo Peninsula of Madagascar. Ocean jasper has a very unique character, as the patterns and colors are so different between them. The base of this piece has been cut flat, which allows it to display nicely without the use of a stand.

Ocean jasper is a rare type of silicified rhyolite (considered both an agate and a jasper), mined in a single location on the Ambolobozo Peninsula of Madagascar. The deposits are found on the coastline (hence the name) and can only be reached by boat and mined during low tide. The deposit formed as a rhyolite flow but has been completely silicified. The rhyolitic eyes or orbs come in an astonishing array of colors and color combinations. The background can be white, pink, green, red, or yellow. Botryoidal formations as well as white and deep green druzy are also common.

Jasper is a term that can be applied to an opaque variety of chalcedony (light does not pass through it) The opaqueness is due to a much larger amount of impurities mixed with silica/quartz. Like agate it may form in a huge variety of colors, and is often multi-colored. In most cases, jasper will occur when silica-rich fluids permeate throughout a soft sediment or volcanic debris deposit. The fluids then crystallize around the particles/impurities, resulting in a cementation process. Most often, the impurities present determine the coloration of the deposit following solidification, however other factors can play a role in the color of what is now considered a jasper.
DETAILS
SPECIES
Chalcedony var. Ocean Jasper
LOCATION
Mine of Marovato, Madagascar
SIZE
19.5 x 14.5", weighs 139.6 lbs
SUB CATEGORY
ITEM
#140964