Iran · Marble

Pietra Grey

also known as Persian Grey, Iran Grey

A dark charcoal-grey Iranian marble with fine, restrained white veining. Consistent and available in volume, it has become a contemporary benchmark for dark feature floors and walls.

Origin: Iranian quarries, Zanjan district, Zanjan region, Iran, Iran
Stone type: Marble (ASTM C503 (marble, worked))
Density: 2.7 g/cm³
Look: dark grey, fine white veining, contemporary
Finishes: polished, honed
Formats: slab, tile, cut-to-size
Exterior use: Best specified for interiors
Est. yield / waste: ~12% indicative (uniform ground reduces offcut)
US import (HTS): 6802.91.05.00 (marble, worked building stone)

Type-level physical facts shown. Per-lot lab values (absorption, flexural strength) confirmed at quotation.

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Origin & quarry

Pietra Grey is sourced from marble beds in northwestern Iran, where geological pressure has produced a dense, even stone with a dark grey ground and restrained white movement. Its consistency across slabs has made it a contemporary benchmark for large dark interior installations.

Geology. Dense crystalline marble, calcite-dominant; the dark charcoal ground comes from carbonaceous inclusions and mineral banding. Fine white calcite veins trace the stone's tectonic fabric.

Where it works

Specify with confidence

Feature floors in dark contemporary interiors
Statement walls and column cladding
Bathroom wall tile and wet room floors
Luxury hospitality corridors and hotel lobbies

Use with care

Acid-sensitive — seal and avoid chemical cleaners
Honed finish preferred for floors (reduces slip, easier maintenance)
Seal before grouting to prevent staining
Outdoor use possible in non-freeze-thaw climates with correct sealant

Verified sources

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Iranian quarry group

Quarry-direct · Zanjan, Iran · Iran

Lithos‑verified 5/5

Quarry-direct or verified processor
Physical samples available
Technical specs documented
Photos verified at source
Export-ready for US trade

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European stone importer

Verified importer · Verona, Italy · Italy

Lithos‑verified 3/5

Quarry-direct or verified processor
Physical samples available
Technical specs documented
Photos verified at source
Export-ready for US trade

Enquire through Lithos

Reference projects

European luxury hotel interiors

Hospitality · Western Europe · 2010s–present

Dark grey Iranian marbles have become a standard specification for luxury hotel corridors and spa interiors in Europe, where consistent tone across large areas is critical.

Gulf residential tower projects

Residential high-rise · Dubai and Gulf states · Various

Persian grey marbles are widely specified in Gulf luxury residential developments for their uniform dark tone and volume availability.

Good to know

Is Pietra Grey consistent across slabs?

It is valued for its relatively uniform dark ground and quiet veining, which makes it easier to specify across large areas than more dramatic dark marbles.

What is the difference between Pietra Grey and Grafite Grey?

Both come from the same Iranian stone family. Pietra Grey is typically the mid-tone grade; Grafite Grey the slightly darker, more consistent version. They are often stocked side by side and the difference is commercial grading rather than geology.

Can Pietra Grey be used outdoors?

It can be specified outdoors in non-freeze-thaw climates when properly sealed and honed, but check the specific lot's absorption data first. Most interior specifications use polished finish.

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