Libyan Desert Glass - 12 Grams Topaz is a silicate mineral

Topaz is a silicate mineral that contains both aluminum and fluorine

Here is an eye-catching example of almandine garnets settled nicely into a schist matrix

Around 200 million years ago

remote localities

Libyan Desert Glass - 12 Grams Topaz is a silicate mineralLibyan Desert Glass (LDG), is a tektite found in the Sahara deserts of Western Egypt, near the Libyan border. No one is positive about how this tektite has formed. Some research suggests the impact of a meteorite may have caused it. The heat and pressure from this impact would have melted the silica through radiation, similar to the thermal radiation present in a nuclear explosion. Another theory is the bursting of an asteroid as it passes through