✦ India · Andhra Pradesh · Granite
Black Galaxy Granite Slab
Also known as Star Galaxy · Nero Galaxy
A deep, near-pure black field scattered with metallic gold bronzite specks — each catching light like a fragment of the night sky. Quarried exclusively in Andhra Pradesh, India. One of the most recognized black granites in global architecture and kitchen design.
6.5–7
Mohs Hardness
<0.2%
Water Absorption
2930
kg/m³ Density
Origin & Geology
Where Black Galaxy Granite Comes From
Black Galaxy Granite is quarried exclusively from a cluster of mines near Chimakurthy, in the Prakasam District of Andhra Pradesh, South India. The unique geological conditions of this limited area — and no other — produce the characteristic mineral composition: a dense black gabbro base interspersed with bronze-gold crystals of bronzite feldspar.
Granite marketed as “Black Galaxy” from other origins is either a different stone entirely or a lower-grade alternative. When sourcing for a specified project, always confirm the quarry certificate of origin. HD Stone supplies certified Andhra Pradesh material with full traceability documentation on request.
The stone rose to global prominence in the 1980s and has remained a standard reference in luxury kitchen and hospitality design worldwide — particularly in the USA, Germany, the UK, and the Middle East. Also traded as Star Galaxy, Nero Galaxy, and Gold Galaxy depending on region and fleck density.
Technical Specifications
| Trade Names | Star Galaxy, Nero Galaxy, Gold Galaxy, Shobha Black |
| Stone Type | Natural Granite (Gabbric Anorthosite) |
| Country of Origin | India — Andhra Pradesh (Chimakurthy) |
| Primary Color | Deep black with gold / bronze metallic specks |
| Mohs Hardness | 6.5 – 7 |
| Water Absorption | < 0.2% |
| Bulk Density | 2,930 kg/m³ |
| Compressive Strength | 290 – 320 MPa |
| Flexural Strength | 20 – 25 MPa |
| Available Thickness | 18 mm · 20 mm · 30 mm |
| Slab Sizes | 240 × 120 cm · 260 × 130 cm · Jumbo available |
| Tiles Available | 30×30 · 60×60 · 30×60 · Custom cut-to-size |
| Surface Finishes | Polished · Honed · Flamed · Leathered |
| Indoor / Outdoor | Both — frost and UV resistant |
| Min. Order | 1 full container (FCL); samples available |
Applications
Where Black Galaxy Granite Is Used
The stone’s exceptional hardness, near-zero water absorption, and resistance to heat make it one of the few natural stones equally suited to demanding interior and exterior environments.
Hotel & Commercial Lobbies
The definitive choice for a dramatic black granite countertop. Heat tolerant, scratch resistant, acid resistant — performs where marble cannot. The gold specks respond dramatically to under-cabinet and pendant lighting.
Kitchen Countertops
The definitive choice for a dramatic black granite countertop. Heat tolerant, scratch resistant, acid resistant — performs where marble cannot. The gold specks respond dramatically to under-cabinet and pendant lighting.
Bathroom Vanity Tops
Low water absorption makes Black Galaxy reliable in wet environments. A honed finish reduces glare and fingerprinting in bathroom applications while preserving the stone's distinctive mineral character.
Exterior Cladding & Facades
UV stable and frost resistant. Black Galaxy is one of the few dark granites that does not fade or surface-degrade in outdoor conditions — suitable for architectural facades, plinths, and exterior feature walls.
Steps & Stair Risers
Compressive strength of 290–320 MPa makes it structurally dependable for stair treads. Flamed or leathered finishes improve slip resistance for public staircases and commercial entrances.
Landscape & Paving
Commercial-grade Black Galaxy is widely used for outdoor paving, pool surrounds, and landscape feature walls. The dark tone holds colour in sunlight and contrasts strongly against light-coloured landscaping.
Quality Reference
Black Galaxy Granite Grades
The quality of a Black Galaxy Granite slab is determined by three factors: the density of gold bronzite specks, their distribution uniformity, and the absence of surface veining or inclusions. HD Stone supplies two commercial grades:
Premium+ Grade
Largest, most evenly distributed bronzite flecks. Near-zero veining. Maximum contrast between black background and gold specks. Preferred for luxury countertops, hotel lobbies, and feature installations where visual consistency is critical across multiple slabs.
Premium Grade
Medium fleck density with uniform distribution. Minimal natural inclusions. The standard specification for residential countertops, commercial flooring, and wall cladding where strong visual impact is required at a reliable price point.
Commercial Grade
Accepts natural geological variation — irregular fleck size or distribution, minor inclusions. Suitable for exterior paving, landscape applications, and non-critical decorative uses where budget efficiency takes precedence.
Material Comparison
Black Galaxy Granite vs Other Black Stones
Not all black stones perform equally. The table below compares Black Galaxy Granite against the other black materials most commonly specified for similar applications.
| Property | Black Galaxy Granite | Absolute Black Granite | Nero Marquina Marble | Black Quartzite |
|---|---|---|---|---|
| Visual Character | Black + gold/bronze specks | Pure uniform black | Black + white veins | Black + subtle movement |
| Mohs Hardness | 6.5 – 7 | 6 – 7 | 3 – 4 | 6.5 – 7 |
| Acid Resistance | ✓ High | ✓ High | ✗ Etches | ✓ High |
| Heat Resistance | ✓ Excellent | ✓ Excellent | ⚠ Moderate | ✓ Excellent |
| Exterior Use | ✓ Yes | ✓ Yes | ✗ Limited | ✓ Yes |
| Distinctive Feature | Gold specks under light | Cleanest solid black | Dramatic white veining | Subtle natural movement |
| Best For | Kitchens, lobbies, feature walls | Minimalist, all-black design | Decorative, low-use surfaces | High-end counter + exterior |
Common Questions
Black Galaxy Granite FAQ
Q1: Is Black Galaxy Granite only quarried in India?
Yes. Authentic Black Galaxy Granite comes exclusively from quarries near Chimakurthy in the Prakasam District of Andhra Pradesh, India. The unique geological formation of this area produces the characteristic bronzite specks. Stone sold as “Black Galaxy” from other countries is typically a different material. HD Stone supplies certified Andhra Pradesh material with origin documentation available on request.
Q2: Can Black Galaxy Granite be used for kitchen countertops?
Yes — it is one of the most recommended black granites for kitchen countertops. Its Mohs hardness of 6.5–7 resists scratches from daily kitchen use. Unlike marble, it does not etch from acidic foods or cleaning products. Its low water absorption (under 0.2%) prevents staining when sealed annually. The polished finish maximises the reflective quality of the gold specks, which intensifies under kitchen lighting.
Q3: What is the difference between Premium+ and Premium grade?
The key difference is fleck density and uniformity. Premium+ slabs have larger, more evenly distributed bronzite specks with near-zero surface veining — the highest-impact visual grade, preferred for hotel lobbies and luxury residential countertops. Premium grade has medium fleck density with minimal inclusions — the standard specification for most residential and commercial projects. We send physical grade reference samples before order confirmation.
Q4: Does Black Galaxy Granite need to be sealed?
Black Galaxy has very low porosity, but an impregnating sealer is still recommended for kitchen countertop and bathroom applications — applied before installation and reapplied once every 1–2 years. For flooring, exterior cladding, and non-kitchen applications, sealing requirements are minimal.
Q5: What is the minimum order quantity for wholesale supply?
Wholesale supply is available per full container load (FCL). For smaller project quantities — individual slabs or cut-to-size pieces — please contact us to discuss consolidation shipping options. Free stone samples are available for specification purposes; buyers cover courier costs.
Q6: What finishes are available for Black Galaxy Granite?
We supply Black Galaxy in four standard surface finishes: Polished (high-gloss, maximum gold-speck visibility — standard for countertops and feature walls), Honed (matte, reduced fingerprinting — preferred for bathroom vanities), Flamed (textured, slip-resistant — for exterior paving and steps), and Leathered (tactile, low-sheen — contemporary countertop alternative).
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Ready to Specify Black Galaxy Granite?
Free samples dispatched within 48 hours. Full container wholesale supply with custom cut-to-size and finish options. Global export from Xiamen.