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CHAP. V. Of Formed Stones.
1. ALL inform'd Stones whatever, being upon no slight grounds, thought chiefly to have their Origin from the mixture of Salts, it may much more certainly be con∣cluded of those which are formed; for as much as all figure (as has fully been shewn elsewhere a 1.1) seems wholy to be attributed to that principle: the mineral Salts in the Earth being no less busy and luxuriant in production of formed bodies there; than the vo∣latile ones in the air, in the pleasant figurations they make in the Snow, as has been shewn by Des Cartesb 1.2, Mr. Hookc 1.3, but much more fully by my worthy Friend the Learned and Ingenious Mr. William Cole, Surveyor of his Majesties Customs in the Port of Bri∣stol, who 'tis hoped will speedily oblige the World with his curious remarks upon that Subject, and many others. The mineral Salts, I say, are no less exercised in the curious formation of bodies in the bowels of the Earth and rocks, than the volatile ones in the Hea∣vens; for it sufficeth it them not to represent only sublunary things, but celestial ones too, either by reflection, or in solid; as in the Se∣lenites and Asteriae, both which though rarely found in this County, yet those which I have met with here of each kind, are quite diffe∣rent from those, I ever met with elsewhere.
2. The Selenites so called, not that it corporally contains the fi∣gure of the Moon, but only by representation, if obverted to it in right angles, as it were in a glass; as it will the Sun as well, and therefore otherwise more rationally call'd lapis specularis; is so ve∣ry rare in this County, that I could heare of it but in two places, viz. at Hartley green and the village of Slindon, where it is dug in the Marle-pits: from the latter of which places I had a piece gi∣ven me by Mr. J. Serjeant of Mill-Meese of a different figure from all those in Oxfordshire: for the Stone Selenites though it have no∣thing of the shape of the Moon in any of its phases, yet it is com∣monly found in some certain figure always agreeable to the Salts of the body wherein it grows, as it does at Slindon in a Cubico-Rhom∣boideal form, all the pieces of it being constantly Hexaedra of equal obliquangular sides, or oblique angled Parallelepipeds, as in Tab. 11. Fig, 1. and upon that account as was conjectured in Ox∣fordshire