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Mineral Of The Day #146: Tennantite
Mohs Hardness Scale: 3-4 Category: sulfosalt mineral, tetrahedrite group Formula: Cu12As4S13
Fun Facts:
Tennantite is an ore of copper and a minor ore of silver and arsenic.
It was named after the English chemist Smithson Tennant (1761-1815).
Tennantite is in an informal group of minerals called "fahlerz" or "fahlores" group, which is named for an old German miners' word meaning "pale ore."
Mineral Of The Day #81: Enargite
Mohs Hardness Scale: 3 Category: sulfosalt, sulfide mineral Formula: Cu3AsS4
Fun Facts:
Enargite gets its name from the Greek enarge, which means "distinct" (referring to this mineral's cleavage).
Typically dark-grey to black, it is a somewhat rare copper mineral.
Its crystals that form tabular or prismatic habits are often pseudohexagonal.
Enargite is used as a minor ore of copper and as mineral specimens!
