metamorphic

Black-and-white veined stone, likely marble or calcite-veined metamorphic rock

Probable calcite marble: predominantly recrystallized calcite (CaCO₃) with dark graphite-, mica-, or amphibole-rich minerals

AI-generated identification · may be incorrect

Dark gray to black, fine- to medium-grained, with white calcite veins and a glassy-to-dull luster on fractured surfaces; calcite has Mohs hardness 3 and effervesces in dilute hydrochloric acid. The specimen appears massive rather than visibly crystalline, and its exact identification cannot be certain from an image alo…

Identified September 6, 2026More metamorphic →

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At a glance

Common name: Black-and-white veined stone, likely marble or calcite-veined metamorphic rock
Scientific name: Probable calcite marble: predominantly recrystallized calcite (CaCO₃) with dark graphite-, mica-, or amphibole-rich minerals
Category: metamorphic
Identified: September 6, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a hand specimen; $30–$100+ if unusually attractive, polished, or locality-documented.

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 carbonate-rich sedimentary rock was metamorphosed, recrystallizing into marble; white veins formed when hot, carbonate-bearing fluids filled fractures. Age depends on locality and cannot be determined visually.

Uses & applications

Used as ornamental or dimension stone, aggregate, carvings, and lapidary material; attractive polished pieces may be used in décor or jewelry.

Geological facts

The strong contrast between dark host rock and white carbonate veining is characteristic of decorative marble and related calcite-rich rocks.

Field identification & locations

Test a fresh surface with dilute HCl, check for calcite softness, and inspect a thin section or streak; common sources include Italy, Greece, Turkey, India, and many metamorphic belts worldwide.