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A cloud of irregularly shaped platelets creates a confetti-like appearance in this Songea sapphire. Specimen courtesy Nomad’s.
Phlogopite mica (brown) along with a winged zircon crystal in a sapphire from Tunduru.
An unusual metallic platelet of unknown identity, along with small zircons in a sapphire from Tunduru.
During heat treatment, primary rutile crystals leech titanium into the surrounding corundum, coloring it blue. This process is termed “internal diffusion.”
A prism of what is probably apatite in an unheated Songea sapphire.
Primary rutile is a common guest in sapphire from Tanzania’s Songea region, as this unheated specimen shows.
Iron-rich silk, in the form of exsolved plates within a sapphire from Tanzania’s Umba Valley.
Iridescent needles within a sapphire from Tanzania’s Umba Valley.
An iridescent fissure in a sapphire from Tanzania’s Umba Valley.
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