Tanzanite is the blue/purple variety of the mineral zoisite discovered in the Merarani Hills of northern Tanzania in 1967, near the city of Arusha. It is a popular and valuable gemstone when cut.
Tanzanite is noted for its remarkably strong trichroism, appearing alternately sapphire blue, violet, and sage-green depending on crystal orientation.
Zoisite (Variety Tanzanite)
Tanzanite is the important gem variety of zoisite (zoisite is also refered
to as epidote)
Color is variable. Gem varieties are often sapphire blue or violet blue.
However, other colors occur, like the red variety (thulite), and a green
variety.
Hardness: 6.5-7 (note this hardness is less than normally desirable for a
gem used in jewelry subject to abrasion by dirt and dust)
Crystal system: orthorhombic
Composition: Ca-Al-silicate (tanzanite color is attributed to a Vanadium (V)
as an impurity strongly pleochroicView an uncut crystal.
Where is it found?
From deep in the foothills of Mount Kilimanjaro in Tanzania comes tanzanite, a gemstone with only a single known source. Tanzanite is one of the most intriguing and desirable precious gemstones of modern times.
1000 times rarer than diamonds, tanzanite has enchanted discerning jewellery buyers seeking rarity and distinction.
Exceptionally brilliant, tanzanite is unique among gemstones for its multi-dimensional colour, radiating a dazzling kaleidoscope of royal blue, violet, indigo, lilac and periwinkle. Tanzanite’s exquisite colour, poised intriguing between blue and violet, is unlike that of any other gemstone.
It is this unique colour, vibrant, individual and youthful, that gives tanzanite a strong, immediately recognisable identity and contributes to its special positioning in both the gemstone and the fine jewellery markets.
The variety of zoisite known as tanzanite was discovered in Tanzania in
1967.
TANZANITE occurs in pegmatite veins (inclusions suggest hydrocarbon-rich fluids) .
WE usually heat treated at 400 - 500 C to remove brown tints,
deepen blue
- Some cats eye varieties due to channels or needles
- Best orientation for color not same for chatoyancy
Clarity is the second most important of the 4 c's when considering Tanzanite
quality. Clarity simply refers to how inclusion-free a gemstone is. Once
again, the most universally accepted and most documented system is the GIA.
You need reliable and genuine information about Tanzanite Origin, Buying Tanzanite Guidelines, Tanzanite quality scale, using 4C,s from Tanzanite Foundation- internationally Recognised. Consider caring of Tanzanite and more information about this world wide worth jewel.
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