Argentotetrahedrite-(Fe), Argentotetrahedrite-(Cd), Argentotetrahedrite-(Zn) and Argentotetrahedrite-(Hg) are four minerals, each being similar to each other but with additional elements in their formulas, visible at the end of the names.
Sadly, there isn't much information about these minerals in the internet or books, thus all four will receive a short general description.
These are found in multiple places all over the world, but usually tiny. Hardness, as indicated for Argentotetrahedrite-(Fe) is 4.
The most usual color for those minerals is shiny gray or black. All are from the Tetrahedrite group.
JE LEEST
The Complete Mineralogical Encyclopædia
Non-fictieThis is an encyclopedia on Rocks, Minerals and Fossils, providing a lot of useful information as well as *𝕊𝕖𝕝𝕗-𝕕𝕣𝕒𝕨𝕟 𝕡𝕚𝕔𝕥𝕦𝕣𝕖𝕤 𝕠𝕗 𝕖𝕒𝕔𝕙 𝕤𝕡𝕖𝕔𝕚𝕖𝕤; *𝔻𝕖𝕥𝕒𝕚𝕝𝕖𝕕 𝔻𝕖𝕤𝕣𝕚𝕡𝕥𝕚𝕠𝕟𝕤; *𝕌𝕡 𝕥𝕠 𝟝𝟘𝟘 𝕊𝕡𝕖𝕔𝕚𝕖𝕤 �...
