What mineral is this?

Dunno, got a pic?

Here's something with a hardness of 6.0, this do you any good?
Orthoclasse

If you want to upload a pic, here are some instructions:
While you can't use the forum's software to upload a picture to your post, you can use one of the popular online image posting websites. I use www.photobucket.com.

Register there, it's easy.

Then while you are on the website, click "Upload".
When the pic is loaded, (just a moment), click "library". That is the spot on Photobucket where all your pics will be held.

When you go to "library", you will see your pic. Click on the pic twice. Now you will come to a screen where the pic is large, and there will be several web addresses on the right side.

Click on the one that says "IMG", (for image). There will be a yellow line saying "copied". That means the IMG, (image) address of your pic is now on your computer's clipboard.

Then come here, start a post, press Ctrl-V (or Paste), and the pic should appear on your A2K post.

Good luck.

Salt?

How about Augite? Does that fit?

Is it a cubical crystal like pyrite?

I thoughta that too, Seac. However as I recall it's a bit softer