Lava docs not contain any unusual substances. Here is an analysis of lava emitted by Vesuvius: Silica, 39; lime, 18; alumina, 14; magnesia, 3; protoxide of iron, 13; potash, 1; soda, 10; water, 2. The specimen therefore closely resembles common wine-bottle glass. In short, lava, though varying considerably in colour and solidity, or friability, and occasionally containing little groups of crystalline minerals, would seem to be a sort of rough natural glass or earthenware mainly produced from wind, chalk, clay and similar common earthy substances.
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https://paperspast.natlib.govt.nz/newspapers/AS19331019.2.132
Bibliographic details
Auckland Star, Volume LXIV, Issue 247, 19 October 1933, Page 10
Word Count
85Untitled Auckland Star, Volume LXIV, Issue 247, 19 October 1933, Page 10
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Acknowledgements
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