An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the
United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Google Analytics Dashboard for Computerized database of the optical properties of the opaque minerals [Compiled from "Tables for microscope identification of Ore minerals", by Uytenbogaardt and Burke]
Computerized database of the optical properties of the opaque minerals [Compiled from "Tables for microscope identification of Ore minerals", by Uytenbogaardt and Burke]