Artificial stone and formation therefor

An artificial stone, which comprises a transparent aggregate, at least one of a light accumulating material or luminescent material by ultraviolet rays, an inorganic filler and a resin, wherein the time required for brightness of the artificial stone after irradiation until saturation at 200 Lx by a D65 common light source to reach 3 mcd/m2 is longer than that for the light accumulation material or luminescent material by ultraviolet rays per se, and wherein

• the particle diameter of the transparent aggregate is 0.1 mm or more and 1/1.5 or less of the thickness of the artificial stone after casting and hardening;
• the average particle diameter of the light accumulating material and/or the luminescent material by ultraviolet ray is 10 μm or more and 300 μm or less;
• the particle diameter of the inorganic filler is less than 0.1 mm;
• and
• the volume of the transparent aggregate is 20% or more and 80% or less.