Topaz is harder than unglazed porcelain, and leaves a scratch rather than a streak. Streak is the color of the powder of a mineral. To observe the steak of the topaz material, you scratch it with a harder mineral, or another mineral equally hard, and then you look at the color of the streak
Apr 30th, 2015
Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.