Guide tecniche · 7 min di lettura

Natural Stone Glossary A–Z: 60+ Trade Terms for Marble & Granite

Navigating the natural stone industry requires a working vocabulary that spans geology, fabrication, logistics, and commercial practice. Whether you are specifying marble for a hotel lobby, sourcing granite for kitchen worktops, or negotiating incoterms for a container shipment, precise terminology prevents costly misunderstandings. This glossary covers 60+ essential terms used in the marble, granite, and natural stone trade — from quarry block to installed slab. It includes fabrication processes (bookmatch, vein-cut, honed, flamed), reinforcement systems (resin, mesh), commercial grades (selection, ICODE), and shipping terms (EXW, FOB, CIF). Written for architects, designers, contractors, and buyers, each term is defined in one to two clear sentences. Use this as a quick reference when reading technical datasheets, reviewing quotations, or communicating with suppliers. For project-specific guidance, contact Marmi di Carrara — we have been exporting Carrara marble and other natural stones since 1956.

A–C: From Antique to Cross-Cut

Antique finish — A textured, aged surface achieved by brushing with abrasive pads or acid, softening the stone's appearance and hiding fingerprints.

Block — A large rectangular piece of stone cut from the quarry, typically 2–4 m long, 1–2 m high, and 1–2 m wide, weighing 10–30 tonnes. Blocks are the raw material for slabs and tiles.

Bookmatch — Two or more adjacent slabs cut from the same block and opened like a book, creating a mirror-image veining pattern across the surface. Bookmatching is used for feature walls, countertops, and floor medallions.

Bush-hammered — A textured finish created by a percussion tool that produces a rough, pitted surface, often used for outdoor paving and anti-slip areas.

Calibrated — Slabs or tiles that have been ground to a uniform thickness, usually ±0.5 mm, ensuring consistent installation. Calibration is essential for large-format tiles.

Carrara marble — A white or blue-grey marble quarried in the Apuan Alps near Carrara, Italy, known for its fine grain and subtle veining. It is the most iconic Italian marble.

Cross-cut — A cut made perpendicular to the natural bedding or veining of the stone, producing a more uniform, less dramatic pattern compared to vein-cut. Cross-cut is often used for floors and cladding where a calm appearance is desired.

Crystallization — A polishing process using acid and steel wool to create a glossy, reflective surface on calcareous stones like marble. It is a maintenance technique, not a permanent finish.

D–F: From Diamond Wire to FOB

Diamond wire — A steel cable embedded with diamond segments used to cut blocks in the quarry or in the factory. It produces smooth, precise cuts with minimal waste.

Dimensional stone — Natural stone that is cut to specific sizes and thicknesses for construction, as opposed to rubble or aggregate. Examples include slabs, tiles, and blocks.

Durability — The ability of a stone to resist wear, weathering, and chemical attack. It is influenced by mineral composition, porosity, and hardness.

EXW (Ex Works) — An incoterm where the seller makes the goods available at their premises; the buyer bears all transport costs and risks from that point. EXW is common for stone purchases from quarries.

Fabrication — The process of cutting, shaping, polishing, and finishing stone slabs into final products such as countertops, vanities, or cladding panels. Fabrication can be done in the supplier's factory or locally.

Fiammato (flamed) — A thermal treatment applied to granite and some basalts, where a high-temperature flame is passed over the surface, causing the crystals to pop and create a rough, non-slip texture. Flamed finishes are popular for outdoor paving.

Fissure — A natural crack or hairline in the stone, often filled with resin or epoxy during fabrication. Fissures are common in certain marbles and are not structural defects.

FOB (Free On Board) — An incoterm where the seller delivers the goods on board a vessel nominated by the buyer; risk transfers to the buyer once the goods are on the ship. FOB is widely used for container shipments of stone.

G–L: From Gang Saw to Limestone

Gang saw — A large machine with multiple parallel blades that cuts a block into slabs in one pass. Gang saws are used for marble and limestone, producing slabs with a slightly textured surface.

Granite — An igneous rock composed mainly of quartz, feldspar, and mica, known for its hardness and resistance to scratches and heat. Granite is ideal for kitchen worktops.

Grain — The natural directional alignment of minerals or veining in stone, which affects cutting and polishing. Cutting along the grain (vein-cut) highlights the pattern.

Honed — A smooth, matte finish with low reflectivity, achieved by stopping the polishing process before the final gloss. Honed surfaces are less slippery and show fewer fingerprints.

ICODE — A commercial grade for marble slabs, typically indicating a high-quality selection with minimal defects, consistent colour, and good veining. ICODE is often used for premium Carrara and Statuario.

Incoterms — International Commercial Terms published by the ICC that define buyer and seller responsibilities in international trade. Common terms include EXW, FOB, CIF, and DAP.

Jamb — The vertical side of a doorway or window opening, often clad with stone slabs. Jambs require precise cutting and finishing.

Limestone — A sedimentary rock composed mainly of calcium carbonate, often with fossils. Limestone is softer than granite and is used for floors, walls, and facades.

M–O: From Marble to Onyx

Marble — A metamorphic rock formed from limestone under heat and pressure, characterized by its crystalline structure and ability to take a high polish. Marble is prized for its veining and elegance.

Mesh — A fibreglass or polymer net glued to the back of fragile slabs (e.g., some marbles and onyx) to reinforce them during handling and installation. Mesh is often combined with resin.

Metamorphic — A rock that has been transformed by heat, pressure, or chemical processes, such as marble from limestone or quartzite from sandstone. Metamorphic stones often have distinctive banding.

Miter — A 45-degree cut at the edge of a slab to create a seamless corner joint, commonly used for countertops and vanity tops. Mitered edges require precise fabrication.

Natural cleft — A rough, split surface characteristic of some slates and quartzites, produced by splitting along natural planes. It is valued for its rustic appearance.

Onyx — A translucent, banded calcite stone, often backlit for dramatic effect. Onyx is delicate and requires careful handling and sealing.

P–R: From Polished to Resin

Polished — A glossy, mirror-like finish achieved by grinding and buffing with progressively finer abrasives. Polished surfaces are standard for marble and granite in interior applications.

Porosity — The percentage of void space in a stone, affecting its water absorption and stain resistance. Low-porosity stones like granite are more stain-resistant.

Quarry — The open-pit or underground site where natural stone is extracted. Quarry selection affects colour, veining, and quality.

Quartzite — A hard, metamorphic rock derived from sandstone, often with a glassy appearance. Quartzite is more durable than marble and is used for high-traffic areas.

Rabbet — A recess cut along the edge of a slab to receive another piece, often used in stone joinery. Rabbets are common in stair treads and cladding.

Resin — A synthetic polymer applied to the surface or back of slabs to fill micro-cracks, enhance colour, and reduce porosity. Resin treatment is standard for many marbles and granites.

Rift-cut — A cut made parallel to the natural grain of the stone, producing a linear, striped pattern. Rift-cut is common for quartzites and some granites.

S–U: From Slab to Unpolished

Slab — A flat, rectangular piece of stone cut from a block, typically 2–3 cm thick, 1.5–2 m wide, and 2–3 m long. Slabs are the primary format for countertops and wall cladding.

Selection grade — A commercial classification indicating the quality of a batch of slabs, based on colour consistency, veining, and defects. Higher grades (e.g., ICODE, Select) command premium prices.

Slab thickness — Common thicknesses are 2 cm (for wall cladding and some countertops) and 3 cm (for countertops requiring strength). Thicker slabs are more expensive and heavier.

Tumbled — A finish produced by tumbling stone pieces with abrasive media, creating a soft, aged, and rounded edge. Tumbled tiles are popular for bathrooms and outdoor paving.

Vein-cut — A cut made parallel to the natural veining of the stone, producing a dramatic, flowing pattern. Vein-cut is often used for feature walls and bookmatched panels.

Veining — The natural lines and streaks of minerals that create the distinctive pattern in marble and other stones. Veining is a key aesthetic factor.

Unpolished — A raw, matte surface left as cut or after light grinding, often used for outdoor applications or as a base for further finishing. Unpolished stone is more porous and requires sealing.

V–Z: From Waterjet to Zinc

Waterjet — A cutting tool that uses a high-pressure stream of water mixed with abrasive to cut stone with extreme precision. Waterjet is used for intricate shapes and inlays.

Wane — A natural, unhewn edge on a stone block or slab, often removed during fabrication. Wane can be a defect if excessive.

X-ray — A quality-control method used to detect internal cracks or voids in blocks before cutting. X-ray scanning helps minimize waste.

Yard — A storage area where blocks and slabs are kept before shipment. Yards are common at quarries and processing plants.

Zinc — A metal sometimes used in stone cladding systems as a flashing or support. Zinc is not a stone but is relevant to stone installation.

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