1
$\begingroup$

I have the following rock/mineral but can't seem to identify. Anybody have an idea what it might be? It's heavy, 3"x3", nonmagnetic (but slightly repels a neodymium magnet), blackish in color with thin brassy crystals. Thanks!

enter image description here

$\endgroup$

closed as unclear what you're asking by gerrit Nov 2 '18 at 12:28

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Nice specimen. It might be something unusual. Do you have a location for the specimen? $\endgroup$ – Gary Kindel Oct 17 '18 at 1:42
  • $\begingroup$ Unfortunately no. It was in a collection passed down from my grandfather who died in 1970's. Thanks. $\endgroup$ – Patrick Garrett Oct 25 '18 at 19:29
  • 1
    $\begingroup$ Have you cleaned the rock? If it was common, I'd say it could be hematite, pyrolusite, or black kyanite, with the latter two being less likely. Doesn't look rod-like enough to be hornblende or arfvedsonite to me. I wish you knew where it was found. Even knowing whether your grandfather found it himself and which places he visited to collect minerals would help. $\endgroup$ – person27 Oct 27 '18 at 22:03
  • $\begingroup$ Please add the missing information according to this guide. $\endgroup$ – gerrit Nov 2 '18 at 12:28