perlite - screened and partially dried perlite pellets and popped perlite - set of two 2-ounce jars A French edition was published

A French edition was published by Le Moult in Paris and never completed

as the depositional environment of this sand was an immense inland sand sea or erg on the western edge of the supercontinent of Pangea

They are on  a cream paper that is only very slightly edge-toned

with no mention of Lehmann

Making multiple purchases

perlite - screened and partially dried perlite pellets and popped perlite - set of two 2-ounce jars A French edition was publishedPerlite 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, which traps water into its mass. Perlite is mined, crushed, partly dried in a rotary kiln and screened to various sizes depending on