I have a large porcelain Coors one (yes, the beer company) and it works great. I have seen the granite ones at Cost Plus and they seem good for heavy grinding. I think if I were going to buy one today I'd get a molcajete like TimT suggested, they have a nice one on Amazon.
https://www.amazon.com/Vasconia-5031764-Granite-Molcajete-Mortar/dp/B001AVREHA/ref=sr_1_4?s=home-garden&ie=UTF8&qid=1539123168&sr=1-4&keywords=molcajete+mortar+and+pestle
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"There is nothing to be learned from the second kick of a mule" - Mark Twain
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