The coarse black sand is made from crushed obsidian. Yes, obsidian like from a cool volcano, boom! The black, reflective material adds a sexy glimmer to your terrarium when mixed into the soil or added on top of the soil.
The coarse white sand is made from crushed glass. It’s a similar translucent white to uncooked rice and it looks beautiful as a top layer to your terrarium soil.
The natural sand ranges from off-white to tan to dark brown. The texture is more even and a bit finer than the black or white sand – the grains are about the size of the poppy seeds from your morning bagel.