igneous, sedimentary, and metamorphic

Drill Core Samples (Varied Lithology)

Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)

AI-generated identification · may be incorrect

Hardness: 3-7 Mohs (variable); Color: grey, green, mottled white, and dark charcoal; Luster: dull to vitreous; Crystal structure: massive to foliated (fine-grained matrix with mineral veining); Cleavage: present in metamorphic sections; Specific gravity: approx. 2.6-3.0.

Hardness: 3-7 Mohs (variable)
Color: grey, green, mottled white, and dark charcoal
Luster: dull to vitreous

Identified March 16, 2026More igneous, sedimentary, and metamorphic →

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At a glance

Common name: Drill Core Samples (Varied Lithology)
Scientific name: Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
Category: igneous, sedimentary, and metamorphic
Identified: March 16, 2026
Method: Standard

AI Estimated Value

$10-$50 per section for common geological samples; $100+ if core contains visible gold or semi-precious mineral crystals.

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

Extracted from the Earth via diamond core drilling. These represent a cross-section of the lithosphere, likely featuring contact metamorphism and hydrothermal veining from diverse geological ages (often Precambrian to Mesozoic depends on site).

Uses & applications

Geological exploration, mineral prospecting (gold, copper, or nickel), and site characterization for engineering and construction projects.

Geological facts

Geologists use 'RQD' (Rock Quality Designation) on these cylinders to determine the stability of the ground. The smooth cylindrical shape is achieved by a rotating hollow bit tipped with industrial diamonds.

Field identification & locations

Identify by cylindrical shape and varying mineral bands. Found at active mining sites or construction survey areas. Collectors should look for 'vugs' or mineral-rich veins within the cylinders.