In2stone
Call Us — 023 9238 1360
Black Marinace Granite

Granite

Black Marinace

25+ Years Experience
1,500+ Projects Completed
4.9 from 100+ Reviews
Free No-Obligation Quote

Full Service — Installation

Our granite range is available with full supply, templating, fabrication and installation across Portsmouth, Fareham, Gosport, Havant, Waterlooville, Chichester, Southampton and the surrounding area, with our services extending to Hampshire, Sussex, Surrey, Dorset and Berkshire . The reach of our installation service depends on the type of project — contact us to discuss your requirements.

Supply & Fabrication — UK Wide

Outside our installation area? We can fabricate granite to your supplied template, or supply the stone directly as-is — anywhere in the UK . Learn more .

The Stone

See the natural beauty of Black Marinace up close — the surface texture, colour depth, and veining that make this granite unique.

A 1.7 billion-year-old geological wonder — ancient river pebbles frozen in time within a dark matrix, each slab a cross-section through a prehistoric riverbed unlike anything else on Earth.

Black Marinace is not just a granite — it is a geological time capsule. This extraordinary Brazilian stone is actually a 1.7 billion-year-old metaconglomerate: ancient river pebbles that were tumbled smooth by flowing water over millions of years, then gradually cemented together within a dark matrix of minerals and geological pressure. Each polished slab is a cross-section through this prehistoric riverbed, revealing perfectly rounded cobbles in various sizes frozen in time within the black stone — a natural mosaic that no craftsman could ever replicate. The visual effect is utterly unique in the stone world. No two slabs of Black Marinace are the same, because the arrangement of pebbles within the matrix is entirely random — each cobble was deposited by ancient water currents in a unique position. The rounded shapes of the embedded stones create a pattern that is simultaneously organic and geometric, natural and almost designed. It is a surface that invites endless examination, as each viewing reveals new pebble arrangements and mineral details. Black Marinace is a statement of individuality. For homeowners who want a worktop that no one else in the world will have — a genuinely unique piece of geological art — there is no material that delivers on that promise more completely. Limited quarry supply makes it a premium stone, but for those who value absolute uniqueness, Black Marinace is priceless.

Performance

How This Stone Performs

Hardness

4 out of 5

Stain Resistance

3 out of 5

UV Resistance

5 out of 5

Heat Resistance

5 out of 5

Scratch Resistance

4 out of 5

Interested in Black Marinace?

Love this stone?

Get a free, no-obligation quote for Black Marinace granite. From template to installation, In2stone handles everything — so you can enjoy your new surface without the stress.

Black Marinace Granite slab

Frequently Asked

Questions About Black Marinace

Is Black Marinace actually a granite?
Geologically, no — Black Marinace is a metaconglomerate, which is a metamorphic rock formed from cemented river pebbles and cobbles. However, it is classified and sold commercially as granite because its physical properties (hardness, density, durability) match or exceed those of true granite. In fact, Black Marinace is harder than most commercial granites, making it exceptionally durable for kitchen use.
How old is Black Marinace granite?
Black Marinace dates to approximately 1.7 billion years ago — a period when the supercontinent Columbia was forming. The rounded pebbles you see in each slab were once tumbling in an ancient river system during the Paleoproterozoic era, long before any multi-cellular life existed on Earth. It is one of the oldest commercially available decorative stones in the world.
Why is Black Marinace granite so expensive?
Black Marinace commands premium pricing for several reasons: limited quarry sources in Brazil, the geological rarity of a commercially viable metaconglomerate, extremely high global demand from designers and architects, and the fundamental uniqueness of each slab. No two pieces are ever the same, making it a genuinely exclusive material. Its extraordinary geological story also adds to its collector appeal.
Can Black Marinace granite be used for a kitchen island?
A kitchen island is one of the best applications for Black Marinace. The large, flat surface allows the full pattern of embedded river pebbles to be displayed without interruption. When guests walk into a kitchen with a Black Marinace island, the immediate reaction is always the same — fascination at the story of ancient rivers frozen in stone. It becomes the natural centre of conversation as well as cooking.
Are the pebbles in Black Marinace granite visible to the eye?
Absolutely — the rounded pebbles and cobbles embedded within the dark matrix are clearly visible on the polished surface and range from small pebble-sized to larger cobble-sized formations. They appear as smoother, lighter-coloured rounded shapes within the dark stone matrix. The contrast between the smooth, rounded pebbles and the darker surrounding stone is what creates Black Marinace's extraordinary visual character.
★★★★★
"We decided to get bespoke granite work tops for our new kitchen and have to say that we are over the moon with them. From the outset, Ian was very professional when selecting the stone, he listened to what we wanted, went through all of the possibilities that we could have for our worktops and went through the process in detail once we had made a decision. The templateing and fitting was carried out by an incredibly professional and helpful team run by Kev, who knew exactly what they were doing and just got on and made my kitchen look amazing. I would highly recommend In2stone for a helpful, knowledgeable and professional service from start to finish."
— Nicky HavardGoogle Review

Why Choose Us

Why In2stone

Invisible Joins & Ogee Edging

The edge profiles and seamless joins other suppliers say they can't do? We do them every week.

"Other quartz suppliers weren't able to offer the ogee edging I wanted — In2stone could."

Olivia Tett

The Quote Is the Price

No hidden costs, no surprises. We consistently beat competitor quotes — even online discounters decline to match us.

"Beat 6 other companies by a mile. Even an online company that claims to beat any quote declined to."

Dean Fitzpatrick

Ian Answers the Phone

No answering machines or sales scripts. You'll speak to the people who'll actually work on your project.

"Ian always answered the phone or called me back — and that was before we even decided to use him."

Carly Rielly