Lily pad Like Inclusions in Peridot
Peridot is a light green gemstone with inclusions that are commonly called lily pad like inclusions. Why do they form? Can they be found in other gemstones?
Lily Pad Like Inclusions in Peridot
Gemmologists like inclusions in gemstones. Inclusions help us to identify gemstones. Certain gemstones have typical Inclusions. In Peridot you can often see a discoid cleavage in the classic “lily pad” shape. These formations usually have a tiny crystal near the center. Sometimes this crystal inclusion is a small black inclusion surrounded by a curved fracture that resembles a lily pad.
These inclusions cannot usually be seen by the naked eye. Only with the aid of a microscope or a jeweler’s loupe can the details of most inclusions be seen.
Certain inclusions are typical for synthetic stones. The inclusion will vary with the method used to produce the synthetic stone. A piece of coloured glass that is the same colour as peridot would have bubbles or swirl marks, but not the lily pad like inclusion of a natural peridot.
In peridot it is a combination of an inclusion and a stress fracture that has created an inclusion that resembles an aquatic plant called a lily pad. The inclusion in the center might be an piece of another mineral (such as chromite, spinel or biotite) or it could be a void. These voids are often referred to as negative crystals. All gemstones can have inclusions, and many of these have stress fractures. These fractures can occur when the gemstone is heated in the ground or when heat-treated by man. Some fractures radiate in a flat, round, disc-like fashion, other fractures take on different shapes.
Although gemmologists are happy to see lily pad like inclusions in peridot, they will also often see mica flakes and minute bubble-like droplets.
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