Definition of perliteCategorized under "General"
Definition as written by Aimee:
A lightweight material prepared from volcanic lava, this is useful as a propagating medium. Crushing it and then applying tremendous heat causes it to expand, creating numerous tiny spaces for air. It is also useful in compost and potting soils.
Definition as written by Magpye:
1) Granular volcanic rock, used to improve the aeration in potting soil. No nutrient value.
2) A natural volcanic glass similar to obsidian, but having distinctive concentric cracks and a relatively high water content. In a fluffy heat-expanded form .. perlite is used as a lightweight aggregate, in fire-resistant insulation and in soil for potted plants.
3) (brand) A mineral expanded by heating to form very lightweight, porous white granules useful in container soil mixes to enhance moisture and air retention.
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