Code: ML214

名稱   紫螢石晶簇	Name   Fluorite
化學公式   CaF2	Chemical Formula   CaF2
莫氏硬度   4	Mohs scale of Hardness   4
描述   螢石是異色的，意味著可以用元素雜質著色。螢石具有多種顏色，因此被譽為“世界上最豐富多彩的礦物”。螢石樣品代表各種陰影中彩虹的每種顏色，以及白色，黑色和透明晶體。最常見的顏色是紫色，藍色，綠色，黃色或無色。較不常見的是粉紅色，紅色，白色，棕色和黑色。通常會出現顏色分區或條帶化。螢石的顏色由多種因素包括雜質，暴露於輻射，並且不存在的空隙的確定色心。	Description   Fluorite is allochromatic, meaning that it can be tinted with elemental impurities. Fluorite comes in a wide range of colors and has consequently been dubbed “the most colorful mineral in the world”. Every color of the rainbow in various shades is represented by fluorite samples, along with white, black, and clear crystals. The most common colors are purple, blue, green, yellow, or colorless. Less common are pink, red, white, brown, and black. Color zoning or banding is commonly present. The color of the fluorite is determined by factors including impurities, exposure to radiation, and the absence of voids of the color centers.
小挑戰 紫螢石晶簇有什麼用？ 它可以用來製成鏡片，製成的鏡片表現出較小的色差使其在顯微鏡和望遠鏡中有價值。螢石光學鏡片也可用於遠紫外線和中紅外範圍	Challenge What is the use of fluorite? It can be used to make lenses, and the made lenses show less chromatic aberration, making them valuable in microscopes and telescopes. Fluorite optical lenses can also be used in the far ultraviolet and mid-infrared range

Reference

https://en.wikipedia.org/wiki/Fluorite

https://geology.com/minerals/fluorite.shtml

https://www.gemsociety.org/article/select-gems-ordered-mohs-hardness/

by Lau Ka Him on 19 April 2021