mineral

Likely serpentine and polished hematite

Serpentine-group minerals, commonly antigorite/lizardite; hematite, Fe₂O₃

AI-generated identification · may be incorrect

The upper specimen is pale green, mottled, and dull-to-waxy, typical of soft serpentine (Mohs 2.5–4). The lower polished black specimen is likely hematite, with metallic to submetallic luster, Mohs 5–6.5, opaque appearance, and relatively high density; image-based identification is approximate.

Identified August 15, 2026More mineral →

Explore Likely serpentine and polished hematite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Serpentine forms when olivine- and pyroxene-rich ultramafic rocks undergo hydrothermal alteration, commonly during plate subduction. Hematite forms by oxidation of iron-bearing minerals in hydrothermal, sedimentary, or weathering environments; exact ages depend on locality.

Uses & applications

Serpentine is used as ornamental stone, carvings, and occasionally architectural material. Hematite is an important iron ore and is also polished for jewelry, worry stones, and mineral collections.

Geological facts

A streak test is especially useful: hematite produces a reddish-brown streak, while serpentine typically gives a white streak. The black piece could alternatively be magnetite or obsidian, but hematite is favored by its polished gemstone-like appearance.

Field identification & locations

Serpentine is common in California, Italy, New Zealand, Canada, and ultramafic terrains worldwide; hematite is widespread globally. Test hardness, streak, density, and magnetism, and avoid assuming identity from color alone.