1. The company is working with tetrahedrite , a common mineral with thermoelectric properties. 2. Pyrite, sphalerite, galena, and tetrahedrite / tennantite are the major sulfide minerals. 3. The two have very similar properties and is often difficult to distinguish between tennantite and tetrahedrite . 4. It crystallizes in the tetragonal crystal system and forms as rounded dissemations within tetrahedrite in quartz veins. 5. Chatkalite can have sizes ranging from rounded grains of about 100 micron when found within a tetrahedrite . 6. California-based Alphabet Energy announced plans to offer a thermoelectric device based on tetrahedrite to turn heat into electricity. 7. In the supergene sulfide enriched zone, ore minerals include pearceite, proustite, tetrahedrite , polybasite, and pyrargyrite. 8. From 1953 until present, all exploration, development and production has been focused on the tetrahedrite silver-copper ores. 9. The company claimed that other thermoelectrics typically produce about 2.5 percent efficiency, while tetrahedrite could achieve 5 to 10 percent. 10. Other thermoelectrics are either scarce, expensive ( $ 24 146 / kg vs $ 4 for tetrahedrite ) and / or toxic.
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