Fahlerz

• (n.) Alt. of Fahlband
Found on http://thinkexist.com/dictionary/meaning/fahlerz/

Fahlerz

Fahlerz or gray copper ore, is of a steel-gray or iron-black colour mineral that occurs crystallized in the form of the tetrahedron and also massive and disseminated. Its fracture is uneven or imperfectly conchoidal. It consists of from 30 to 40 per cent of copper with iron and sulphur;
Found on http://www.probertencyclopaedia.com/browse/HF.HTM

Fahlerz

Tetrahedrite
Found on http://www.translationdirectory.com/glossaries/glossary077.htm
No exact match found