This Specimen has been sold.
5.4" Polished Kambaba Jasper Freeform - Madagascar
This is a beautiful, hand polished freeform made from Kambaba Jasper found in Madagascar. It is 5.4" tall and has dark circular mineral formations throughout the jasper. The base has been cut flat so that it displays nicely on a hard surface and would be suitable as either an indoor or outdoor decorative piece.
Kambaba jasper and crocodile jasper are trade names for a greenish rhyolitic (volcanic) rock found in the west-central Bongolava region of Madagascar. It is full of blackish orbs consisting of small Amphibole needles that some people say resemble amphibian eyes, hence the name "crocodile jasper". There is a common misconception that Kambaba Jasper is a stromatolite, however this is incorrect as it is volcanic in origin. Despite the misconceptions it is a beautiful decorative stone when polished.
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 higher concentration of impurities mixed with silica/quartz. Like agate it may form in a wide 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.
Quartz, Pyroxene & Alkali Feldspar Conglomerate
Tsiroanomandidy, West-Central Bongolava, Madagascar
5.4 x 4.2"