Concord Geology on Twitter: "Have you ever seen the rock perlite? It forms when glassy volcanic rock absorbs water (hydrates). Perlite contains numerous curved fractures, and remnants of less hydrated glass (black "
Mother Earth Perlite #3 - 4 cu ft - Walmart.com
Perlite for Plants - 15QT Organic Perlite Bulk for Indoor Plants, Succulents, Vegetables, Garden, Horticultural Perlite for Soil, Potting Soil Mix, Root Cuttings, Seed Starting