名稱: 石膏	Name: Gypsum
化學公式: CaSO4•2H2O	Chemical Formula: CaSO4•2H2O
莫氏硬度: 2	Mohs scale of Hardness: 2
描述: 石膏是一種軟硫酸鹽礦物，由二水合硫酸鈣組成，化學公式為CaSO。  4.·2H2O。它被廣泛開採，用作肥料，並作為多種形式的灰泥，黑板/人行道粉筆和乾式牆的主要成分。	Description: Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO. 4. · 2H2O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall.
小挑戰:  問：使用石膏有哪些危害？ 答：如果處理不當，石膏會刺激皮膚，眼睛，粘膜和上呼吸道。	Challenge: Q: What are the hazards of using Gypsum?   A: If handled improperly, gypsum can cause irritation to the skin, eyes, mucous membranes and the upper respiratory system.

Reference

https://geology.com/minerals/mohs-hardness-scale.shtml

https://en.m.wikipedia.org/wiki/Gypsum

https://homeguides.sfgate.com/gypsum-dangers-81601.html

by Hung Yuen Ying on 17 April 2021