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What is a perlite?

What is a perlite? Here are some definitions.

Noun
  1. (mineralogy) An amorphous volcanic glass formed by the hydration of obsidian.
  2. The lightweight insulating material and aggregate resulting from expanding perlite glass by heat.
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Examples
If the problem is reoccurring for you, think about switching from a peat-based mix to one that only contains perlite and vermiculite.
These buckets are of a plastic material and hold about four gallons of perlite.
Make a cut below a leaf joint and dip the cutting in hormone rooting powder before inserting it into an open peat-free compost and perlite mix.
I use a mixture of commercial potting mix and compost with extra additions of perlite, bonemeal, and poultry grit.
To improve drainage without sacrificing nutrients, add sharp sand or perlite to a good sterilized compost-based mix.
Germinate seeds in containers filled with a sterilized mix of equal parts soil, sphagnum peat moss and perlite.

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