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Material categories

Five block categories sourced across our quarry network. Characteristics below are general, industry-standard material properties, not a claim about a specific quarry or lot — exact grading and specification are confirmed per container once a trade account is active.

granite

An igneous rock formed from slowly cooled magma, granite is prized in the trade for hardness, scratch resistance and a crystalline, speckled grain. It is widely used for countertops, flooring, cladding and monument work where durability under daily wear matters.

· Igneous rock
· Mohs hardness ~6–7
· Low porosity
· High compressive strength

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Granite stone, representative example — Granite, polished — representative example.
Photo: James St. John, Wikimedia Commons, CC BY 2.0

Material-grain study

marble

A metamorphic rock formed from recrystallized limestone, marble is valued for its characteristic veining and polish. It is softer and more porous than granite, which makes it a trade favorite for interior surfaces, flooring and sculptural work where finish quality is the priority.

· Metamorphic rock
· Mohs hardness ~3–4
· Moderate porosity
· Takes a high polish

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Marble stone, representative example — Marble quarry, Carrara, Italy — a classic marble source, shown for illustration.
Photo: Ingo Mehling, Wikimedia Commons, CC BY-SA 4.0

Material-grain study

travertine

A form of limestone deposited by mineral springs, travertine is known for its naturally porous, banded texture. Common in flooring, wall cladding and outdoor paving, it is typically sold filled and honed, or unfilled for a more rustic finish.

· Sedimentary rock
· Mohs hardness ~3–4
· Naturally porous/banded
· Common fill or honed finish

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Travertine stone, representative example — Travertine terraces, Pamukkale, Turkey — a natural travertine formation, shown for illustration.
Photo: A.Savin, Wikimedia Commons, FAL

Material-grain study

limestone

A sedimentary rock formed from compacted marine deposits, limestone has a consistent, fine-grained texture and reads as a quieter, more uniform material than granite or marble. It is widely used in cladding, flooring and architectural stonework.

· Sedimentary rock
· Mohs hardness ~3–4
· Fine, uniform grain
· Common in architectural cladding

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Limestone stone, representative example — Limestone — representative example.
Photo: James St. John, Wikimedia Commons, CC BY 2.0

Material-grain study

basalt

A fine-grained volcanic rock, basalt is dense, dark and known in nature for its distinctive hexagonal column-jointing as it cools. In the trade it is valued for strength and a minimal, matte finish, and is common in paving, cladding and landscape work.

· Igneous (volcanic) rock
· Mohs hardness ~6
· Very low porosity
· Dense, fine grain

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Basalt stone, representative example — Basalt columns, Giant's Causeway — a natural basalt formation, shown for illustration.
Photo: Rod Allday, Wikimedia Commons, CC BY-SA 2.0

Material-grain study