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This inclusion in an emerald contains a liquid, a gas bubble, and a cube-shaped solid material. The gas bubble is the dark bean-like shape and the solid cube is to its right. - Photo by John I. Koivula/GIA
The cross-shaped inclusion is a transparent crystal in a natural emerald. - Photo by Dr. E. J. Gübelin/GIA
The needle-like inclusions in this emerald are a mineral called actinolite [ak-tin-uh-lite]. Another inclusion—probably tourmaline—lies between the two actinolite needles. - Photo by John I. Koivula/GIA

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