Is my molcajete 100% Basalt?

Joined Apr 2, 2017
Hey everyone. I purchased this on eBay. The ad said it was 100% Basalt. The item also had all good reviews from people who purchased them from him as well. I just thought that Basalt was darker? I don't want to keep it if it's a concrete/Basalt one. Thank you and I hope the pictures help you help me!

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