Granite Rock Formation: Is It Intrusive or Extrusive?
When you look at a polished granite countertop or a massive mountain peak like El Capitan in Yosemite, you are looking at one of...
How to Identify Quartz in the Field: A Step-by-Step Guide
Quartz is the most abundant and widely distributed mineral found at Earth's surface. It is present and plentiful in all parts of the world,...
Gold vs. Pyrite: A Field Guide to Identifying “Fool’s Gold”
Every geologist, prospector, and rock hound has experienced that sudden rush of adrenaline when a glint of yellow catches their eye in a rock...