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Grandidierite

This bluish-green mineral is found almost exclusively in Madagascar, though the first (and, presumably, only) clean faceted specimen (described here) was recovered from Sri Lanka. Like alexandrite and tanzinite, grandidierite is pleochroic, and can...

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Poudretteite

The first traces of poudrette were discovered in the mid 1960s in the Poudrette quarry of Mont Saint Hilaire, Quebec, but it wasn’t officially recognized as a new species of mineral until 1987, and...

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Benitoite

This striking blue stone has only been found, as its name suggests, near the head waters of the San Benito River in San Benito County, California ( some sources say it has also been unearthed...

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Tanzanite

10 Gemstones Much Rarer Than Diamond The catchphrase you hear tossed around about tanzanite is that it’s 1000 times rarer than diamond, which it very well may be, considering that it’s found almost exclusively...

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Alexandrite

Alexandrite is renowned for its strange optical properties – it can actually undergo dramatic shifts in color depending on what kind of light it’s in. To be clear: this color change is independent of...

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Painite

In 2005, The Guinness Book of World Records called painite the world’s rarest gemstone mineral. First discovered in Myanmar by British mineralogist Arthur C. D. Pain in the 1950s, for decades there were only...