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.
The company was acquired by Marquee Holdings Inc. in 2004. At the time, AMC was publicly traded on AMEX under the code AEN. Marquee is an investment vehicle controlled by affiliates of J.P. Morgan Partners, LLC, the private equity arm of JPMorgan Chase, and Apollo Global Management, a private investment firm.