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small piece of rough tanzaniteTanzanite Rough Mineral | Stone Mania

Tanzanite Mineral

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Product Code: TNZ-0



Rare Tanzanite Rough Mineral


Rough pieces of tanzanite individually chosen by Stone Mania during one of our many buying trips to South Africa.  This rare and highly sought after mineral found only in Tanzania exhibits a vitreous lustre so each stone interacts with light beautifully.  Sadly it's extremely difficult to capture in a photograph the way that some minerals reflect light so for the true beauty of these stones to be fully appreciated, you'll need to have them in the palm of your hand.

Tanzanite which is said to be rarer than diamonds is renowned for its sensational blue to violet colour but the vast majority of cut stones are heat treated.  As well as enhancing the shade and depth of colour, heating the mineral also removes undesirable tints of brown and yellow which are  relatively common.  With these pieces all being rough tanzanite they have not been heat treated.

The mine in Tanzania which sits at the foot of Mount Kilimanjaro is just four kilometres wide by two kilometres long and the availability of gem-grade material is rapidly depleting.  The vast majority of tanzanite is cut and polished for use in jewellery and stones are often set alongside diamonds.  The finest grade stones can command exceptional prices per carat and are in high demand .

Unlike many of the world's most popular gemstones, tanzanite was only discovered in large enough quantities for it to be used commercially in the 1960's.  A variety of the mineral zoisite, it was originally known as blue-violet zoisite but was renamed by the American jeweller Tiffany & Co in 1968 just before introducing the stone to the world.  They declared it to be the most beautiful blue stone to be discovered in 2000 years and stated that it could only be found in two places, Tanzania and Tiffany & Co.

Translucent tanzanite crystals exhibit pleochroism which means stones appear to change colour when viewed under certain light from different angles.  Heating is believed to reduce this unique characteristic.  The colour of all of our tanzanite pieces is more or less the same but our our lighting and the angle from which some photos were taken has caused some to look slightly bluer. 

Weights and sizes for each piece of tanzanite can be found on the respective listing pages below.     



Weight (grams) : 5.6
Size (cms) : 2.4 x 1.5 x 0.7
Weight (grams) : 10.4
Size (cms) : 2.4 x 2.1 x 1.6
Weight (grams) : 11.1
Size (cms) : 3.2 x 1.7 x 1.4
Weight (grams) : 14.4
Size (cms) : 2.3 x 2 x 1.6
Weight (grams) : 20.1
Size (cms) : 3.7 x 2.4 x 1.5

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