Information about Rainbow Calsilica and the Jewellery that uses this Stone.

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When Rainbow calsilica first appeared on the fashion jewelry scene several years ago, it made quite a splash! With its bright, vivid, and varied colors, it is not hard to understand why calsilica captured the imagination of jewellery designer and jewellery wearers alike.

So what is it and where does it come from? My wife and I have be selling the stone for over 6 years and have lately spent many hours looking through the internet to get conclusive evidence about exactly what it is and and where it comes from and this is what I have concluded...

It is not a real stone and this is my argument as to why...firstly, and this is very non-scientific, is does sometimes tend to look a little bit unnatural - we sell many different gemstone stones natural and unnatural and there are to many things about this one seem odd when compared with other stones. But here is my main reason for not believing that it is not natural... If I was selling/marketing this stone, and it was natural but there were mant doubts about it being natural, I would bring conclusive proof, with if not a good video at least quality photos. From what I have seen so far there is only one very poor quality photo of the stone in the ground. It has been over 9 years now surly there would be more evidence - there is simply to much of it around.

The general consensus agrees with what I have said, if it is man-made then it would be an amalgamation of various minerals and stone fragments that are held together with resin. Often, the powder and fragments are deposited under water and compressed to form cake. The cake is dried and infused with resin. Once the resin hardens, varies pieces are cut from the block, and then polished to achieve the desired sheen.

Although many claim that calsilica (or "rainbow calsilica" as it is sometimes called), is a naturally occurring material, there is little evidence to support this claim. The most persistent claim (and it still persists today!) was that calsilica was mined in Chihuahua, Mexico. Calsilica was allegedly discovered in the veins or seams of the volcanic rhyolite in the mine. Here is a website of people claiming that they have proof. Here is another website that claims it to be real...

Here is the only photo of the stone in the ground...

Rainbow Calsilica was thought to be a form of microcrystalline calcite, with various clay minerals as the bonding agents. Supposedly, the mine in Mexico would send out letters of authentication and photographs of the mine. Now there are rumors of a spectacular deposit of natural calsilica in China. In 2003, the Swiss Gemological Institute ( ) published a brief note on calsilica in one of their newsletters. SSEF purchased two specimens at a mineral show in France in 2002. The seller produced photographs of the mine in Mexico, along with a authentication letter from a US laboratory stating that the materials were not man-made. They found that the base white materials were indeed a calcite. However, they also found that man-made coloring pigments within the specimens. More importantly, SSEF found that the particles were bonded together by a transparent soft, plastic-like material that was very similar to paraffin wax.

There is a huge controversy regarding the stabilization of the stone, which is a common practice for turquoise. Many companies claim to get the material from the mine in Mexico and then they do the stabilization. Geologists are denied access to the mine to determine if the stone is in fact real or manufactured. The denied entry stems from the fear of exploitation of the stone or theft.

Rainbow Calsilica is a microcrystalline calcite synthetically or naturally bonded with the clay mineral allophane. Silica is also present. It has been described as vein matter or fracture fill formed when a copper push cut into volcanic rhyolite host rock. A stabilization process similar to that used with turquoise has been used whether at the mine or at other producers companies. The basic makeup of the stone is calcite in allophane but seems to have man made pigments or artists pigments in the blue, yellow, and green layers, and the other layers contain hematite in the red layer and celestine in the black.

Some people say who cares if its natural or not, but in the gemstone industry it is important to know. Alot of poeple don't care if its natural or not but there are some people who think it is very important to know if a stone is natural or not. Something created in nature for some people makes a item all the more special.

It's beautiful material, natural or not, it is...a nice stone to wear!


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Discover Jewellery just like what is pictured above.

Discover Jewellery just like what is pictured above.

Discover Jewellery just like what is pictured above.

Discover Jewellery just like what is pictured above.

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