Premium Black Granite from Uruguay
The Purest Black on Earth
ウルグアイ産 黒御影石 | 南美黑
"King of Black Stones"
About the Material
1.3億年の地質史が生んだ究極の黒
Uruguay Black is a premium dolerite quarried in Uruguay, South America. Formed 130 million years ago when volcanic magma cooled slowly deep underground during the Paraná flood basalt event, it possesses an extraordinary purity found nowhere else — completely free of veins, cracks, and inclusions. Among all commercially quarried black stones worldwide, Uruguay Black stands alone as one of the darkest and purest, earning its title: King of Black Stones.
Commercially classified as black granite, Uruguay Black is geologically a dolerite — a dense, fine-grained mafic intrusive rock. This distinction is what gives it superior hardness, extremely low water absorption, and permanent color stability compared to true granites.
ウルグアイブラックは南米ウルグアイで採掘されるプレミアム黒御影石（岩石学的には粗粒玄武岩/ドレライト）です。1億3千万年前、パラナ洪水玄武岩イベントの際に地下深くでマグマがゆっくり冷却して形成されました。筋・割れ・石胆が一切なく、世界で規模的に採掘されている黒色石材の中で最も純粋な黒を実現しています。
Technical Data
検査報告書データ | 检测报告数据
| Property / 検査項目 | Value | Standard Requirement |
|---|---|---|
| Bulk Density / 体積密度 | 3.00 g/cm³ | ≥ 2.56 g/cm³ |
| Water Absorption / 吸水率 | 0.03 % | ≤ 0.60 % |
| Compressive Strength (Dry) / 圧縮強度（乾燥） | 124 MPa | ≥ 100 MPa |
| Compressive Strength (Saturated) / 圧縮強度（水飽和） | 174 MPa | ≥ 100 MPa |
| Flexural Strength (Dry) / 曲げ強度（乾燥） | 27.2 MPa | ≥ 8.0 MPa |
| Flexural Strength (Saturated) / 曲げ強度（水飽和） | 30.1 MPa | ≥ 8.0 MPa |
| Mohs Hardness / モース硬度 | 7 | — |
| Radioactivity Classification / 放射性分類 | Class A | No usage restriction |
Test Report No. 2021C-WJ0198 — Xiamen Products Quality Supervision & Inspection Institute
Tested per GB/T 18601-2009 (Natural Granite Slabs) and GB 6566-2010 (Radioactivity of Building Materials)
検査報告書番号 2021C-WJ0198 — 廈門市産品質量監督検験院
The national standard allows up to 0.60%. Uruguay Black's water absorption of 0.03% is 20 times lower than the maximum requirement — one of the lowest values among all commercially available black granites worldwide. This ensures exceptional resistance to weathering, frost damage, and color change over decades of outdoor exposure.
国家標準の上限0.60%に対し、ウルグアイブラックの吸水率はわずか0.03%。基準値の20分の1という驚異的な低さで、風化・凍害・経年変色に対する極めて高い耐性を保証します。
Market Position
黒御影石の比較 | 黑色花岗岩竞品对比
| Stone / 石材 | Origin / 産地 | Density | Water Abs. | Known Issues |
|---|---|---|---|---|
| Uruguay Black | Uruguay | 3.00 | 0.03% | None reported |
| Kunnam / クンナム | India | ~3.00 | ~0.02% | Counterfeits widespread |
| PAN | India | ~2.95 | Low | Large blocks scarce, fakes common |
| YKD / インド黒 | India | ~2.90 | Low | Slightly lighter color |
| Zimbabwe Black | Zimbabwe | ~2.95 | Low | — |
| Belfast / ベルファスト | South Africa | ~2.95 | Low | Gold spots in some grades |
| Shanxi Black / 山西黒 | China | ~2.95 | ~0.11% | Color fading & rust over time; declining use in Japan |
Note: Competitor data based on published industry sources. Uruguay Black data from certified test report.
注：競合データは業界公開情報に基づく。ウルグアイブラックのデータは公認検査報告書に基づく。
Product Range
製品等級 | 产品等级
Finest grain pattern, deepest black after polishing. Premium grade for high-end tombstones and luxury architectural applications. Exceptional mirror finish quality.
Slightly larger grain with excellent polish. Ideal for tombstones, countertops, and architectural cladding. Best balance of quality and value.
Standard grade with visible grain. Cost-effective option for general construction, paving, landscaping, and exterior applications.
Unprocessed Uruguay Black appears gray on its natural surface — this is a characteristic shared by all premium dolerite worldwide. After cutting and polishing, the true deep black color is fully revealed. The same stone produces dramatically different visual results depending on surface treatment: polished surfaces show deep, mirror-like black; sandblasted or flamed surfaces show refined dark gray tones.
未加工のウルグアイブラックは表面が灰色に見えます。これは世界中のプレミアム粗粒玄武岩に共通する特徴です。切断・研磨後に真の深黒色が現れます。研磨面は鏡のような深い黒、噴砂やバーナー面は上品な濃灰色になります。
Applications
用途 | 应用场景
Premium black granite for Japanese-style tombstones. Ultra-low water absorption (0.03%) ensures permanent color stability with no fading or rust — a true "eternal black."
Facade panels, wall cladding, and feature surfaces for luxury residential and commercial projects. Large block sizes available for seamless coverage.
Kitchen countertops, bathroom vanities, flooring, and dramatic feature walls. Mirror polish reveals maximum depth of color.
Surface plates and measurement bases. Low thermal expansion coefficient and uniform hardness ensure lasting flatness and accuracy.
Sculptural works and artistic installations. Fine grain and high hardness enable exceptional detail in carving and engraving.
Available in polished, honed, sandblasted, flamed, and bush-hammered finishes. Each finish reveals a different character of the same stone.
Supply Chain
サプライチェーン | 供应链
Directly owned quarry in Uruguay, South America. Over 100 years of mining history in the region. Stable, consistent supply of high-purity rough blocks.
Cut and finished in Fujian, China. Experienced processing facilities for slabs, tiles, custom sizes, and monument fabrication.
Worldwide shipping available. Rough blocks or processed products. FOB Fujian or CIF destination port.