metamorphic

Drill-core rock, likely foliated metamorphic rock

Indeterminate from the photograph; possibly slate, phyllite, or schist

AI-generated identification · may be incorrect

Gray to dark gray, fine-grained, with visible planar foliation and pale mineral veins; hardness and specific gravity cannot be determined visually. The cylindrical pieces are drilled core samples, not naturally shaped specimens.

Identified October 5, 2026More metamorphic →

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At a glance

Common name: Drill-core rock, likely foliated metamorphic rock
Scientific name: Indeterminate from the photograph; possibly slate, phyllite, or schist
Category: metamorphic
Identified: October 5, 2026
Method: Standard

AI Estimated Value

Typically little standalone collector value; representative core pieces may sell for about $5–$30, while value depends on provenance and scientific significance.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Likely formed when clay-rich sedimentary rock was altered by heat and pressure, producing foliation; its age and precise formation setting are unknown from the image.

Uses & applications

Drill cores are used for geological mapping, mineral and energy exploration, and engineering investigations; the rock itself may have construction or aggregate uses depending on its composition.

Geological facts

Red markings and arrows are sample-orientation or logging annotations, and the trays preserve the order of core recovered from a borehole.

Field identification & locations

Look for aligned platy minerals, cleavage, and compositional layering to distinguish slate, phyllite, and schist; mineral identification or thin-section analysis is needed for a reliable name. Drill core is commonly collected worldwide during subsurface exploration.