metamorphic

Graphitic schist (likely carbonaceous slate)

Graphite-bearing pelitic schist; mainly quartz, mica, feldspar, and graphite

AI-generated identification · may be incorrect

Dark gray to black, foliated and layered, with a dull to subtly metallic sheen; graphite may mark paper. Hardness is roughly 2–4 overall (graphite ~1–2), with micaceous cleavage and variable specific gravity around 2.6–2.8.

Identified September 14, 2026More metamorphic →

Explore Graphitic schist (likely carbonaceous slate) 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

Formed when carbon-rich mudstone or shale was buried and metamorphosed under directed pressure, aligning mica and graphite into foliation. Such rocks commonly formed during Paleozoic or older mountain-building events, though exact age requires locality data.

Uses & applications

Used locally as decorative stone, roofing or landscaping material, and occasionally as a low-grade graphite source; typically not a gemstone.

Geological facts

The pale intersecting lines are likely quartz or calcite veins cutting the foliation, while the dark sheen suggests graphite or fine mica. It may also be a carbonaceous slate rather than true schist.

Field identification & locations

Look for planar splitting, silky or greasy dark surfaces, and gray-black streak; graphite-rich material feels slippery and leaves a dark mark, whereas slate is harder and more uniformly dull. Common in metamorphic mountain belts worldwide.