metamorphic

Likely marble or foliated calcite-rich metamorphic rock

Calcite (CaCO₃), probably recrystallized limestone; exact identification is uncertain from the image

AI-generated identification · may be incorrect

White to pale gray, fine- to medium-grained, with dark gray streaks or weak foliation and a dull-to-slightly sugary luster. Calcite has Mohs hardness 3, rhombohedral crystals, excellent rhombohedral cleavage, and specific gravity about 2.7; it should fizz with dilute hydrochloric acid.

Identified August 21, 2026More metamorphic →

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At a glance

Common name: Likely marble or foliated calcite-rich metamorphic rock
Scientific name: Calcite (CaCO₃), probably recrystallized limestone; exact identification is uncertain from the image
Category: metamorphic
Identified: August 21, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as an ordinary specimen; $20–$100+ if unusually patterned, polished, or locality-labeled.

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

Formed when limestone undergoes heat and pressure, recrystallizing its calcite; likely Paleozoic or younger, though age cannot be determined visually. The layered appearance may reflect original bedding, impurities, or deformation during metamorphism.

Uses & applications

Marble is used for tiles, countertops, sculpture, aggregate, and lime production; attractive pieces may be polished for decorative stone, but this specimen appears common and weathered.

Geological facts

Gray streaks commonly represent graphite, clay, quartz, or other impurities. A vinegar test may produce weak fizz, while hydrochloric acid gives a stronger reaction.

Field identification & locations

Common in metamorphic belts worldwide, including Italy, Vermont, Colorado, Greece, and India. Confirm with acid effervescence and a hardness test; quartz-rich look-alikes will not fizz and are harder.