Hey Sid! I know its hard to tell because there are no images or location of your mineral for me to go off of, but before I take a guess, a helpful thing you could potentially do is do the Mohs hardness test to determine what category your mineral could be in. However, If I had to take a guess, I would guess the rock you have to maybe be in the Igneous family. Again, as an educated guess, maybe you have what is called Gabbro, an igneous rock formed by magma, is dark grey to black color and can have a shiny surface caused by the feldspar inside of it if it's chipped off or can naturally be shown. Hope that can somewhat help you in finding out what it is! Have a good day.
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Here is something we offer:
The Department of Earth & Atmospheric Sciences Mineral Laboratory at the Metropolitan State University of Denver offers FREE non-destructive & destructive mineral identification services as part of their geoscientist training program and university community outreach. Samples will be assigned to students in Mineralogy & Optical Mineralogy during the Fall semester ONLY and analyzed under supervision by the instructing professor according to the clients specification. Clients will be presented with a full analytical report by the end of the semester and non-destructive tested specimens will be returned upon request (Please provide SASE or pickup at the Earth Science laboratories at MSU Denver).

This is a FULL report where we will present you with physical analysis, full-fledged geochemical analysis, as well as crystallographic XRD analysis and complete, easy to understand interpretation. There is no limit on how many samples you can submit. There may not be enough capacity to do them all, therefore we are usually resorting to a first come, first served system. Samples should be mailed to our laboratory end of August.

I don't know if we are allowed to post links on this forum to point you to the sample submittal forms. But you can contact me via email and I will send the you the link if you are interested.

Uwe Richard Kackstaetter, Ph.D. (Dr.K)
Full Professor of Geology - Specializing in Applied Geology and Mineralogy
Department of Earth & Atmospheric Sciences
Metropolitan State University of Denver
Office: SI2017
(720) 257-4486
kackstae@msudenver.edu
URL: college.earthscienceeducation.net