perlite - screened and partially dried perlite pellets and popped perl – Geological Specimen Supply
Perlite is a hydrated form of obsidian. When a mass of obsidian picks up water, it devitrifies and becomes amorphous perlite. The unhydrated core of the obsidian mass may weather out as an obsidian spherule called an Apache Tear. Perlite can also form by the sudden cooling and solidification of rhyolitic volcanic ash
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Horticulture Grade Perlite - Horticultural grade perlite is derived from a naturally occurring, volcanic rock. When furnaced at high temperatures,
Supreme Perlite Medium Horticultural Grade Expanded Perlite – 4 Cubic Foot – 113 Liters – 103 US Dry Qrts – Indoor & Outdoor Use – OMRI Listed
Perlite - Wikipedia
Perlite - an overview
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Perlite
Revuelta, Manuel Bustillo. 2021. Construction Materials. Geology
