1. Gypsum powder is usually white and colorless. Colorless and transparent crystals are called transparent gypsum, and sometimes they are gray, light yellow and light brown because of impurities. The stripes are white. Transparent. Glass luster, cleavage plane pearl luster, fiber aggregate.

Stone flowers and plants shaped like a group of fungi grow in the sea. Every day, people in the back door like to take them home to dry and make them into cool petrochemical food. Don't break off things like oyster shells and stick them to stones and flowers when washing. After washing, put it in a pot and blanch it with boiling water. After cooking, pour it into a bowl, add a spoonful of white rice vinegar, and then put it in the refrigerator to cool. The stone flowers cooked in this way are very brittle. Cut it with a spoon and add some sugar or honey. It tastes good. There is a simpler way to buy stone pollen and brew it at home, just like soaking milk powder.