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Through this and other masonry the hot waters have been percolating for centuries, and have given rise to various zeolites apophyllite and chabazite among others; also to calcareous spar, arragonite, and fluor spar, together with siliceous minerals, such as opal all found in the inter-spaces of the bricks and mortar, or constituting part of their re-arranged materials.
Among them the species Analcime, Stilbite, Natrolite, and Chabazite may be mentioned as of most common occurrence. The microscope has shown that pure quartz is oftener present in lavas than was formerly supposed.
The minerals referred to are analcime, chabazite, Thompsonite, and finally, the mineral which I first found in this formation, Hayesine, which is extremely rare, and of which I only obtained sufficient to cover a square inch. The particulars in regard to its locality, etc., maybe found in the American Journal of Sciences for June, page 458.
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