Turquoise and Hematite

Physical Properties

Turquoise: Hardness 5-6, waxy to sub-vitreous luster, triclinic system, blue-green color. Hematite: Hardness 5.5-6.5, metallic luster, hexagonal system, dark grey to black color.

Formation & Geological History

Turquoise forms via secondary weathering of copper-rich host rocks in arid regions. Hematite forms through the oxidation of iron-bearing minerals or precipitation from water.

Uses & Applications

Predominantly used for ornamental purposes, jewelry beads, and lapidary arts. Hematite is also a major ore of iron.

Geological Facts

Turquoise has been mined since at least 3000 BCE in Sinai; hematite is known as 'bloodstone' because it leaves a reddish-brown streak when rubbed on a streak plate.

Field Identification & Locations

Identify turquoise by its characteristic spider-web matrix or robin's egg blue color; identify hematite by its metallic sheen and heavy weight. Common in the American Southwest, Iran, and China.

Identified on: 4/25/2026

Mode: Standard