Description
FACTS
properties of tanzanite
- Belongs mineralogically to zoisite
- Hardness grade 6,5-7
- Chemical formula: Ca2Al3(SiO4)3OH
- Includes the colors blue, violet and brown
- By heating it develops its famous blue color
- Density from 3,29 – 3,4
origin
worth knowing
- Only place of discovery: Tanzania
- Tanzania locality was discovered in 1967
- Was mineralogically known as “Zoisite” for a long time
- Became known worldwide through the movie “Titanic”
Tanzanite as an investment
- Rare, strongly increasing in value
- finds become less, because there is only 1 mining area
- rather bigger stones are preferable
- Larger stones have higher increase in value
- stones with deep blue color are to be preferred
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