Gemstone Hardness. The Mohs scale of mineral hardness was created by German mineralogist, Friedrich Mohs, in 1822 to measure the relative hardness or scratch resistance of various minerals. He based it on ten readily available minerals. As it is an ordinal scale, two minerals must be compared to decide which is harder. The scale is neither linear nor logarithmic.
AMC Black tickets are exchange items that are NOT eligible toward earning AMC Stubs rewards either at time of purchase or time of redemption. Valid seven days a week. Yellow Ticket Terms and Conditions. Not Valid in: CALIFORNIA, NEW YORK, and NEW JERSEY Present at box office only.
Only AMC BLACK Tickets will be accepted in California, New York and New Jersey. All other states use AMC Yellow Tickets. AMC Tickets are good at AMCÂ®, AMC Showplace, LoewsÂ®, Cineplex Odeon, Magic Johnson and Star theatres. Perfect for date night, holiday gifts, employee incentives & rewards. Choice of Tickets: Ten (10) Yellow AMC Movie Tickets #1111121 (Not Valid in California, New York or New Jersey)