Fahlore, or Fahlerz, refers to an ore consisting of complex sulfosalts, mostly the series between

tennantite Tennantite is a copper arsenic sulfosalt mineral with an ideal formula . Due to variable substitution of the copper by iron and zinc the formula is . It is gray-black, steel-gray, iron-gray or black in color. A closely related mineral, tetrahedri ...

and

tetrahedrite Tetrahedrite is a copper antimony sulfosalt mineral with formula: . It is the antimony endmember of the continuous solid solution series with arsenic-bearing tennantite. Pure endmembers of the series are seldom if ever seen in nature. Of the two, ...

. It comes from the German word for pale, ''fahl''. This refers to the characteristic pale grey to dark black colour.

References

Sulfide minerals {{mineral-stub