Is Absolute Black actually granite, and will it show water spots in a bathroom?
Last updated November 2026.
Quick answer
- Look
- Solid black, very consistent color and texture
- Rock type
- Usually gabbro or diabase; sold as granite
- Origin as listed (MSI)
- India
- Variation (MSI)
- Low
- Sealing (SlabWise)
- Dense black: about every 3–5 years
Usually not. Stone sold as black granite is generally gabbro, a dark rock low in quartz, or a fine-grained cousin called diabase. Absolute Black is sold under the granite label anyway. It is dense and consistent, but polished black shows mineral spots, so plan on drying it.
Ask about a piece in Absolute Black granite
Is Absolute Black actually granite?
Probably not strictly. Wikipedia's granite article says commercial usage is vague and that stone sold as black granite is usually gabbro. Gabbro is a coarse-grained dark rock built from pyroxene and calcium-rich plagioclase, low in silica. Its entry adds that it is hard and difficult to work.
Diabase, also called dolerite, is the fine-grained version, chemically equal to gabbro and basalt, and it is cut for headstones and countertops. MSI lists Absolute Black simply as granite from India with very consistent color and texture, so which rock your slab is cannot be read from the sales page. Ask the supplier for the petrographic name.
What are the properties of Absolute Black granite?
| Property | Absolute Black granite |
|---|---|
| Color | Black primary and accent; very consistent color and texture [1] |
| Other trade names | Jet Black, Nero Absolute, Telephone Black [1] |
| Origin and finish (MSI) | India; polished; variation low [1] |
| Sold as 'black granite' | Usually gabbro, which has a different chemistry from granite [2] |
| Gabbro | Coarse-grained, pyroxene and calcium-rich plagioclase; hard and difficult to work [3] |
| Diabase | Fine-grained equivalent of gabbro and basalt; also called dolerite; used for countertops [4] |
| Density, granite average | 2.65–2.75 g/cm³ (about 165–172 lb/ft³) [2] |
| Sealing for dense black granite | May need it only every 3–5 years [5] |
| Hard water | Standing water leaves mineral deposits that dull the finish; dry the surface [5] |
Numbers in brackets refer to the sources at the end of this page. Natural stone varies block to block.
Planning a piece in Absolute Black granite?
Tell us about the room. We reply within one business day with options, and every quote gives the exact dimensions and weight of the piece.
Which rock names hide behind black stone?
| Rock | Texture | Main minerals | Where it fits |
|---|---|---|---|
| Granite (strict) | Coarse, light | Quartz 20–60%, feldspar, mica | Rarely black |
| Gabbro | Coarse, dark | Pyroxene, calcium-rich plagioclase | Often sold as black granite |
| Diabase / dolerite | Fine, dark | Plagioclase, augite | Cut for countertops and memorials |
Sources: Wikipedia entries for granite, gabbro and diabase, read November 2026. Not a ruling on any specific slab.
Will Absolute Black granite show water spots and soap film?
A polished black face is a good mirror for dried droplets. SlabWise says standing water, especially hard water, leaves mineral deposits that dull the finish over time and recommends drying the surface. Fingerprints and toothpaste splatter read the same way on a uniform black. The consistent color that MSI emphasizes means no pattern to camouflage them.
Wipe with a microfiber cloth after use. Skip vinegar and abrasive pads, which SlabWise advises against.
How often does Absolute Black granite need sealing?
Rarely. SlabWise says a dense Absolute Black may barely absorb water and need sealing only every 3–5 years, against annual sealing for light, porous granites. Marbleseven agrees that dark dense granites are significantly less porous. Run the water test rather than the calendar, and do not stack sealer on a stone that does not need it.
Where does Absolute Black work in a bathroom?
MSI lists it for countertops, bathroom vanity walls, shower walls and flooring, polished only. Vanity tops are the natural fit: dense, heat-tolerant and tolerant of cosmetics. On a floor, a polished black is slick when wet, so ask for a honed or leathered finish. Shower walls need correct waterproofing, which a licensed installer and local code decide.
How heavy is an Absolute Black vanity top?
MSI lists 3 cm slabs. At about 168 lb/ft³, our working figure for granite, a 3 cm top weighs about 16.5 lb per square foot. A 49 × 22 inch top is roughly 7.5 square feet, so about 124 lb before the sink cutout. Gabbro can be denser than granite, so the real figure may run higher; the supplier's density data is the reliable number.
Wikipedia's granite entry gives 2.65–2.75 g/cm³ as an average density for granite. We could not find a published density for Absolute Black itself.
What should you ask a supplier to confirm what the rock is?
Nobody needs a geology degree to buy a vanity top, but three questions settle most of the ambiguity.
- What is the petrographic name of the stone (gabbro, diabase, or other)?
- What are the absorption and density figures for this lot, and which test method produced them?
- Is the slab resin-filled, and is the polish natural or treated?
Does Pietra Fonte make pieces in Absolute Black granite?
We don't currently offer granite. If you want black in a solid piece, see Nero Marquina marble at Nero Marquina marble, which etches like marble, or discuss a custom piece at the bespoke page. The honest tradeoff is in marble vs granite vanity tops. The wider stone list is under /stones.
Sources
Every piece is made to order. Tell us about the room and we reply within one business day.
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