G778 黑色玄武岩 产地：中国贵州 密度：3.00G/cm3，硬度比山西黑弱，但比其他黑色石头强 吸水率：0.08% 抗压强度：200MPa 颜色：纯黑色，有些许白点，但不明显 -- Code of China: G778 -- Country of Origin: Guizhou, China -- Bulk Density: 3.00G/cm3, no harder than Shanxi Black, but harder than other black stone like Mengolian Black. -- Water Absorption: 0.08% -- Compressive Strength: 200MPa -- Color: pure black, it is similar to shanxi black, with petty white spots, but it won't influent it's pure black appearance.