Rough Perlite
Rough Perlite

Rough Perlite

Regular price $10.00
Unit price  per 
Available now Learn more
Shipping calculated at checkout.

We have 5 in stock.
Add to Wishlist

Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. Perlite has the unusual characteristic of expanding and becoming porous when it is heated. It can expand to as much as twenty times its original volume. Expansion occurs when the glassy lava rock is heated to 871°C and the water molecules trapped in the rock turn into vapor causing the rock to expand.

These are a lovely olive-green colouring.