Jewellery Insides’ Post

Kornerupine – To Rare, but To Diverse Gemstone! 🫒 🤲 Kornerupine, also known as Prismatine, is a rare and complex borosilicate mineral with the simplified formula (Mg,Fe²⁺)₄(Al,Fe³⁺)₆(SiO₄,BO₄)₅(O,OH)₂. It crystallizes in the orthorhombic crystal system (dipyramidal habitus), making it doubly refractive. Discovered in 1884, it was named after Danish geologist Andreas N. Kornerup (1857–1881). With a hardness of 6.5 to 7 on the Mohs scale it is suitable for jewellery. Remember, a vitreous luster can help in determination! 🙌 Kornerupine is an appealing gemstone, available as both transparent gems and cabochons with semi-transparent or opaque qualities. Its typical colours are brown, greenish-brown, brownish-green, or greyish-brown. Rarely can be colourless, light beige, vibrant green, emerald green, bluish-green, blue, pink, or violet. Kornerupine is especially valued as a gemstone when found in translucent green to yellow shades, with emerald green varieties being particularly sought after. With prismatine it forms a solid solution series and is strongly pleochroic, appearing green and reddish-brown. Some Kornerupine cabochons found in Sri Lanka and India display a striking cat’s eye effect. Do you agree, or you saw another hue?? 🤌 The finest deposits of Kornerupine are found in Sri Lanka (Matara, Embilipitiya, and Ratnapura), Burma (Mandalay), Madagascar (Ambovombe-Androy and Betroka), India (Orissa), and Kenya (Kwale), where an apple-green variety rich in vanadium occurs, and exceptionally attractive colours from Tanzania deposits. 📷 Green Oval 0.99 ct Kornerupine, at the time of posting, online available for sell for 180$, link in comments © Yavorskyy Co Ltd. #Gemstones #Gems #Gemmology #Minerals #Mineralogy #RareGems #ColourGems #Crystals