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This is a rare crystal mineral found in Tanzania Africa.

Tanzurine is the name given to a recently discovered form of Quartzite from northern Tanzania. It had been found as two distinct coloured forms one being a mid to deep ruby red toned known as Cherry 

Tanzurine and is believed to contain a lithium based Mica the second form is a mid to deep green toned known as Emerald Tanzurine and is believed to contain the chromium based mica Fuchsite.

 Both forms are very similar to Aventurines.