The name “andesine” comes from the Andes Mountains and “labradorite” was derived from Labrador, Canada, where labradorite – the opaque non-transparent kind was first discovered. This material falls between andesine and labradorite. Hence its long name which is more accurate and descriptive.

Andesine and labradorite are two distinct minerals but with very similar chemistry. Mineralogists determine which is which by the percentage of sodium to calcium within their structure. As a matter of fact, when the percentage of sodium and calcium is equal (50/50), they are all one and the same.

This may not happen often, but it does create a gray area on the dividing line. This close relationship between the two minerals also creates another dilemma: Gemologists cannot separate the two with the standard array of tools available to the trade.

Since their chemical, optical, and physical properties overlap, every stone would have to be sent out to major universities or laboratories for individual identification. This involves substantial time and cost. To avoid that added cost, the name “andesine-labradorite,” was coined because tests show that the material falls within those boundaries.

Since their beautiful color was the determining factor in purchasing these red and green varieties of feldspar, not their exact chemical composition, this was the fairest name for this material. Authorities in the gemstone industry agreed that this was a responsible way to identify this product.