theroseknows wrote:I am from the "drink it however you like it" camp, and my teeth are already chipped anyway. Therefore, my biggest concern is what they do to your glass.
Do they scuff/scratch up your glasses over time? Immediately? I am not going to buy them if they are going to ruin my glassware.
My guess is that you're safe since glass is pretty hard. That's why it's an informal test for diamonds, the hardest substance (10) on the 10-point Moh's Scale (although cubic zirconia will also scratch glass). On the other hand, soapstone is made mostly of talc, the softest mineral on the scale (1). Soapstone is so soft that your fingernails, which ranks around Mohs 2.3, can scratch it. Glass, which is mostly quartz, is around a Mohs 6-7. As for your teeth, they're around a MOhs 5.
In absolute terms, glass/quartz is about 100 times harder than talc/soapstone (diamond is 1600 times harder than talc!). In other words, your glasses are pretty much safe from these whiskey stones.