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An amateur geologist has been travelling around in USA and has found 4 new samples for his collection. He's examining their degrees of hardness based on the Mohr scale, which ranges from 1 to 10. Wuzzite has a Mohr value of 6, while the mineral used for sculptures has a value of 4. Zipite is not used for sculptures. The mineral used for cheap jewellery is green. Gadgite is used in electronic components. The mineral found in Texas will soon be a new food additive. The black mineral was found in Georgia. The Californian mineral had a Mohr value of 7. Whodunnite was not found in Arizona. Zipite is not metallic blue. The white mineral has a Mohr value of 8.
What's the name of the black mineral?
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