Obsidian

Hardness of 5 to 5.5 on the Mohs scale, deep black color, vitreous luster, amorphous crystal structure, and exhibits sharp conchoidal fracture.

Formed as an extrusive igneous rock when felsic lava cools rapidly with minimal crystal growth, often associated with volcanic regions.

Used historically for sharp cutting tools and weapons, and currently popular for jewelry, ornamental objects, and holistic crystal healing.

Due to its extremely sharp edges, obsidian has been used experimentally for surgical scalpel blades. The provided coordinates fall within the East African Rift system where volcanic activity and obsidian deposits are entirely plausible.

Identified easily by its dark, glassy appearance and razor-sharp conchoidal fracture edges. Commonly found globally near modern or ancient volcanic flows.