I split open one of my larger pieces and was please to find some beautiful mineralization with great contrasting colours.

Rock was collected in Wawa, Ontario, Canada. Matrix is calcite / sulfur / iron oxide weathering. Mineralization is pyrite and I'm unsure what the silver mineral is but my guess is an arsenide or raw nickel. Any insight is welcome.

The larger pyrite crystal is about 1.25cm.

Thanks!

Thanks for the post Steve. Really nice to see all the beautiful specimens and extremely rare books. This post always makes my day.

Thank you to everyone who has contributed. Take care and be safe. cheers, Shane

Anyway... this was a small-town rock shop find.  Sometimes when browsing small local rock shops, you never know what you're going to come across, and you might stumble on a real treasure now and again. I believe the specimen came from Arizona, but I got a pretty good deal on it from a local rock shop in Shoshone, Idaho, when I took a road trip out there about a month ago. (Probably shouldn't mention the actual price because, you know, "Mindat Does Not Give Valuations" and what not, but let's just say it was a good deal for a cabinet specimen.)  Specimen is roughly 5 inches/12.5 centimeters across.