Fall 2016 - Volume 52, Issue 3
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Iridescent andradite garnet from Japan with an iridescent andradite inclusion.
Andradite in Andradite

An iridescent Japanese andradite contained an iridescent inclusion of andradite, creating an arresting optical phenomenon.

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Aquamarine with a dramatic secondary growth layer
Unusual Growth Zoning in Beryl

A striking aquamarine specimen showed a strongly saturated secondary growth layer.

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A cat’s-eye beryllonite cabochon, two faceted samples, and a partially polished specimen
Growth Blockages in Cat’s-Eye Beryllonite

A rough colorless beryllonite showed an unusually sharp separation between two regions, caused by minute inclusions deposited during growth that prevented growth of the host mineral.

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A mobile violet-colored fluorite crystal inclusion in quartz
Mobile Fluorite in Quartz

A violet-colored fluorite crystal inclusion in quartz was free to move within its octahedral void.

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Negative crystals and growth tubes in a spinel from Madagascar
Etch Marks, Negative Crystals, and Etch Tubes in Spinel from Madagascar

A spinel from Madagascar, mixed in with a parcel of blue sapphire, exhibited an array of internal features.

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Sphalerite crystal inclusions in topaz
Sphalerite in Topaz

The first documented example of sphalerite as a crystal inclusion in colorless topaz.

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Trigonal growth features on a blue cap tourmaline termination
Tourmaline Termination

The blue cap termination from a tourmaline crystal was preserved and polished, yielding a unique designer gem.

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An iridescent cleavage in tanzanite
Iridescent Inclusion in Tanzanite

A tanzanite displayed crystallographically aligned, vividly iridescent colors resulting from fine separations along the stone’s cleavage planes.

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Quartz with ferroaxinite inclusions, from Calaveras County, California
Quarterly Crystal: Quartz with Axinite

The first visual record of axinite inclusions in quartz published in the gemological literature.

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