Black And Gold Marble Slab
Black and Gold Marble Slab
Material: Natural calcareous marble (calcite), microcrystalline
Color: Black field with golden yellow flower-shaped veins
Origin: China
Size: 2400up x 1200up mm and 2600up x 1600up mm; tiles, slabs and countertops to your list
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Product Introduction
The gold veins in a black and gold marble slab are the reason a buyer orders the stone: they are two different materials in one plate, because the black matrix is a fine-grained calcareous marble and the gold is a zone of different mineral composition where partial dolomitization and the oxidation of marine material have produced pyrite and limonite colour running from intense yellow to honey. A junction between two mineral compositions is a natural plane of weakness, and the consequence is blunt: a slab fractures along a gold vein far more readily than through the black around it, so the feature the customer is paying for is the place the stone wants to break.
Products Description
| Parameter | Specification |
|---|---|
| Product Name | Black and Gold Marble Slab; Portoro marble slab; Athens Portoro Marble - Polished Slab; Brand: YoYo Stone |
| Also Listed As | black and gold marble slab, black with gold marble, black marble with gold veins, gold flower marble, Athens Portoro marble, New Italy Portoro |
| Origin and Naming | China. Genuine Portoro comes only from the La Spezia province of Liguria, so this Chinese black and gold marble is quoted on its description, not the Italian place name |
| Stone Type | Natural calcareous marble, microcrystalline, formed in a calm oxygen-poor marine environment. Not a granite and not a quartzite |
| Colour | Black field with golden yellow flower-shaped veins, from intense yellow to honey. The black comes from marine organic matter in the original sediment |
| Vein Composition | The gold is a different mineral composition, produced by partial dolomitization and the oxidation of marine material as pyrite and limonite; that junction is a natural plane of weakness |
| Stock | 10,000 m2 held in stock |
| Slab Sizes and Available Thickness | Slabs 2400up x 1200up mm and 2600up x 1600up mm; thickness 10-70mm, 1.5cm and 1.8cm in stock, 2cm and 3cm cut to order; tolerance +/-1mm or +/-0.5mm calibrated |
| Surface Finishes | Polished standard, which takes a very high brightness; honed and leather face also available. A honed face hides water marks that a polished black field reflects |
| Grade Selection | Graded by colour intensity and vein pattern, from a clean black field with fine gold veining down to busier plates. A bookmatched pair is taken from one block |
| Cutout and Vein Planning | Sink and hob openings are set off the heaviest gold at layout; rails are rodded and internal corners radiused, since a cutout on a delicate vein is where stone opens |
| Water Absorption | 0.03 percent |
| Density | 2.729 g/cm3 |
| Strength | Wet compressive 116 MPa; dry compressive 163 MPa; bending strength 16 MPa. Strong in compression, weak across a vein |
| Etching and Care | A calcite marble: lemon, wine and coffee etch it, and the mark shows plainly on a glossy black field. Sealed at fabrication, pH-neutral cleaning, reseal every 6 to 12 months |
| Price Drivers | The grade and the vein, not the name: colour intensity, vein pattern, fractures along the gold, slab size, thickness, whether a bookmatched pair comes from one block, and container fill |
| Application | Floor and wall decoration, kitchen and bathroom decoration; feature walls, bar faces, vanities, fireplace surrounds, bookmatched panels and inlays |
| Packing | Face to face in a seaworthy wooden crate or A-frame, foam lined, edges and corners protected, steel banded, fumigated to ISPM-15 |
| Quality Control | Three stages: raw material checked before producing, checked one by one during production, and checked one by one before packing |
| Minimum Order, Samples and Lead Time | No MOQ by crate. Free sample with freight collect or prepaid; tiles, slabs and countertops supplied to projects, importers, distributors and wholesalers worldwide; 3-4 weeks for one 20ft GP |
Quality Standards
Quality Control & Inspection Standards
Inspection on a black and gold marble slab starts before the slab is bought, because the defect that matters most is one you can only see while you still have a choice.
Vein integrity read before the slab is committed
Every slab is examined for existing fractures and weak zones running along the gold, and for the vein pattern the drawing actually needs, since a fracture along a gold vein is the one fault that will not survive cutting and cannot be filled invisibly on a black field.
01
Grade sorting against the drawing
Slabs are sorted by the intensity and pattern of the coloration, from a clean black field with fine gold veining through to busier plates, because a job that mixes two grades reads as two different stones once the panels are mounted side by side.
02
Layout planned around the veins before any cut
Cutouts, seams and inside corners are set off the heaviest gold on the cutting drawing rather than on the saw, since a sink or hob opening placed on a delicate vein concentrates stress exactly where the stone is weakest.
03
Rodding and radiusing at the vulnerable points
Rails are rodded and internal corners radiused generously on any cutout near heavy veining, and cuts crossing a prominent vein are run with generous water and a controlled feed instead of being forced through.
04
Bookmatch dry lay and written approval
A pair from one block is laid face up and read as a mirror, with the seam checked against the vein so the gold continues across the joint, and the composition is photographed and signed off before the edges are cut.
05
Products Application
Typical Project & Application Scenarios
Accent walls and inlay work
A single bookmatched panel or a floor inlay set into a calmer field, where the gold veins are expected to read as a drawing and the layout is planned before the first cut.
Bookmatched vanity tops and washroom panels
A black and gold marble slab is chosen for a small area that has to carry a room, and the two leaves of one block are opened across the joint so the gold runs into itself, with the basin cutout set off the heaviest vein.
FAQ
Everything You Want To Know
01. Is this black and gold marble real Italian Portoro?
No, and the distinction matters. Genuine Portoro comes from one small area of the La Spezia province in Liguria, around Portovenere. This is a Chinese black and gold marble, sold on its description and graded on its own colour and vein.
02. Why do the gold veins matter structurally?
03. How are cutouts handled on a veined black marble slab?
04. What actually drives the price of a black and gold marble slab?
05. Does a black and gold marble slab etch, and how does it show?
It etches, because it is a calcite marble. Lemon, wine and coffee dissolve a microscopic layer of the polished face, and on a glossy black field the dull mark shows plainly. Seal it, clean with pH-neutral products, and use coasters.
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