igneous, sedimentary, metamorphic

Mixed rock collection

Labeled specimens appear to include iron-rich rock, schist, basalt, serpentinite, and shale

AI-generated identification · may be incorrect

The image shows several small, mostly dark green-brown specimens with earthy to slightly granular luster. Exact hardness and composition vary: basalt ~6 Mohs, schist ~4–7, serpentinite ~3–5, shale ~2–4, and iron-rich rocks commonly ~5–6.

Identified September 10, 2026More igneous, sedimentary, metamorphic →

Explore Mixed rock collection 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

These represent different geological origins: basalt is volcanic igneous rock; shale is compacted sediment; schist is metamorphosed mudstone; serpentinite forms by hydrothermal alteration of ultramafic mantle rock; iron-rich rocks form through oxidation or chemical sedimentation.

Uses & applications

Primarily educational or collector specimens; basalt and iron-rich rock may be used as aggregate or industrial stone, while schist and serpentinite can be decorative materials. They are generally not gem-quality jewelry material.

Geological facts

The handwritten labels appear to read “iron rich rock,” “schist,” “basalt,” “serpentinite,” and “shale,” making this a comparative classroom collection rather than one identifiable specimen.

Field identification & locations

Identify each piece by its label plus texture: schist commonly shows glittering mica layers, basalt is dense and fine-grained, serpentinite is waxy green, shale splits into thin layers, and iron-rich rock shows red-brown to black staining. Common sources include volcanic, metamorphic, and sedimentary terrains worldwide.