Code: ML226

名稱   坦桑石	Name   Tanzanite
化學公式   Ca2Al3(SiO4)(Si2O7)O(OH)	Chemical Formula   Ca2Al3(SiO4)(Si2O7)O(OH)
莫氏硬度   6 – 6.5	Mohs scale of Hardness   6 – 6.5
描述   坦桑石僅在地球上的一個地方發現，是相對較新的發現，它是在12月發現。坦桑石像蛋白石一樣堅硬。坦桑石是由少量釩引起的礦物鋅礦石的藍色和紫色變種。坦桑石屬於顯子礦物群正交晶系。坦桑石僅在坦桑尼亞的梅拉拉尼山附近很小的礦區中發現。	Description   Found in just one place on earth, tanzanite is a relatively recent discovery which is in December. Tanzanite is as hard as opal. Tanzanite is the blue and violet variety of the mineral zoisite, caused by small amounts of vanadium. Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Tanzania, in a very small mining area near the Mererani Hills. It belongs to the Orthorhombic crystal system.
小挑戰   坦桑石比鑽石稀有嗎？   一位坦桑尼亞地質學家說，導致它在5.85億年前形成的情況是如此特殊，以至於在地球上其他任何地方發現坦桑石的可能性都是百萬分之一，這比鑽石稀有一千倍。	Challenge Is Tanzanite rarer than diamonds? According to a Tanzanian geologist, the circumstances that led to its formation 585 million years ago were so exceptional that the likelihood of finding tanzanite anywhere else on earth is one in a million, making it a thousand times rarer than diamonds.

Reference

https://geology.com/gemstones/tanzanite/

by Wong Trinity on 17 Mar 2021