The first known specimens came from Saualpe, in the Carinthia region of Austria. In 1805, mineralogist Abraham Gottlob Werner named the mineral "Zoisite" to honor Baron Zois (mineral collector), who was the first to recognize it as a distinct mineral.
Zoisite is a calcium aluminum silicate mineral belonging to the epidote group. It is best known for its coloruful gem varieties such as tanzanite, thulite, and anyolite (ruby-in-zoisite). Zoisite occurs in metamorphic and hydrothermal environments and can appear in various colours.
ZOISITE VARIETIES:
1. Tanzanite (Blue zoisite) --> Blue to violet
Treatment --> Rare, heat-treated for vivid colour
Location --> found only in Tanzania
2. Thulite (Pink zoisite) --> Pink to reddish
Trace element: Coloured by manganese, often opaque,
Cut: carvings and cabochons
3. Anyolite (Ruby-in-zoisite) --> Green with ruby
Cut--> Cabochon ornamental stone, contrasting colours
OCCURRENCE:
--> Metamorphic rocks like schists and gneisses
--> Hydrothermal veins
--> Associated with minerals such as garnet, amphibole, feldspar, and quartz
MAJOR SOURCES:
--> Tanzania (especially for tanzanite and anyolite)
--> Norway (thulite)
--> Austria (type locality)
--> India, Kenya, and the USA
Tanzanite is a rare and stunning gemstone known for its vivid blue to violet hues and remarkable pleochroism, meaning it can show blue, violet, and burgundy colours depending on the viewing angle.
Key Facts:
--> Colour Blue to violet (can range from pale to deep tones)
--> Transparent
--> Vitreous Luster
--> Often heat-treated to enhance the blue-violet colour
--> Due to limited supply, it's considered a collectible and investment gem
Thulite is the pink variety of zoisite, admired for its vibrant pink to rose-red colour, often mottled with white or grey. Its striking hue is due to the presence of manganese, and it is commonly used in cabochons, carvings, and decorative objects rather than faceted gems.
Key Facts:
--> Colour Pink to rose-red (sometimes with white or grey inclusions)
--> Opaque to translucent
--> Vitreous to pearly Luster
--> Usually untreated and valued for its natural patterns
Ruby-in-Zoisite, also known as Anyolite, is a striking metamorphic rock that features vivid red ruby crystals naturally embedded in green zoisite, often with black hornblende inclusions. The unique colour contrast and natural patterns make it a popular gemstone for carvings & cabochons
Key Facts:
--> Colour Green (zoisite) with red (ruby) and black (hornblende) inclusions
--> Opaque to semi-translucent
--> Vitreous to pearly Luster
--> Natural combination of two distinct minerals: zoisite and corundum (ruby)
--> Typically, untreated, though ruby areas may fluoresce under UV light
We use cookies to analyze website traffic and optimize your website experience. By accepting our use of cookies, your data will be aggregated with all other user data.