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Mangan Vesuvianite-Translucent to transparent complete single crystal with deep purple coloration. Crystal is undamaged, though there is an incomplete small partial crystal attached to the back. Excellent color.

Dravite crystal exhibiting the "Usambara effect" color change (named after nearby mountains) / Nchongo, Umba Valley, Tanzania

Liddicoatite - The photo shows a slice from a single crystal of liddicoatite, a member of the tourmaline family. The color-zoning reveal the crystal's history, just as the rings in a tree records its past. Crystals may start and stop growing many times. In most cases, there is no way of knowing how long each phase lasted. This particular crystal changed color as it grew. The pink portion of the liddicoatite formed when the solution feeding it was manganese rich.

Cuprian Smithsonite from Tsumeb Mine, Namibia - just love the change from neon green to leaf green

Cactus quartz (Spirit Quartz) is a new mineral that was discovered in South Africa in February 2002

Chrome Vesuvianite. Translucent to transparent complete single crystal with bright emerald green coloration. Crystal is undamaged.

✯ Kyanite :: From Merelani Hills . Lelatema Mountains . Arusha Region . Tanzania /

sugilite/richterite . This crystal is said to be the crystal of Archangel Michael. That is why I am pinning this here.