Transparent darker blue aventurine with big, glittery dichro-like sparkles. Great for layering or backing, also mixes down with other colors to add sparkle. Heavy Blue Stardust is darker blue sapphire with a higher density of sparkle, than the regular Blue Stardust. The usual cautions against long, hot garaging technically apply since this is an aventurine color, however it is stable in implosions and encasements.