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3 questions about minerals and the Mohs scale! Help asap!?

1. How could you estimate the hardness of a mineral that does not appear on Mohs scale?

2. Soapstone is sometimes used to make sinks. Soapstone is largely composed of talc. What special care would you take in cleaning sinks made of soapstone?

3. Emily has an opal that fell out of a ring. She plans to keep the opal, which has a hardness of 5 or 6, with her mineral samples. She knows the opal will be safe. How is that possible?

These are the three questions I'm stumped on so please answer them and just explain it to me so I understand them! Thank you thank you!

These are an excellent set of questions to get you to think with some logic.

1. Use reference materials like glass, a penny, a nail, a knife etc. as well as othe rninerals to narrow down the hardness. Its a very simple process, mineral A is harder (or softer) than mineral B, and so on...

2. Don't use hard abrasive objects.

3. Opal is not a mineral; it has a variable composition and crystal symmetry and therefore is a mineraloid. Certain forms of opal can be as soft as 4.5, so the other mineral samples must be softer than 4.5.