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Excerpt from An Elementary Introduction to the Knowledge of Mineralogy: Comprising Some Account of the Characters and Elements of Minerals; Explanations of Terms in Common Use; Descriptions of Minerals, With Accounts of the Places and Circumstances in Which They Are Found; And Especially the Localities of British Minerals
If however we pursue the investigation further, we shall find that the three earths above mentioned are compound bodies, consisting on the average of about 50 per cent. Of oxygen, com binod with the bases, silicium, alumium, and calcium, in the preportion also of 50 per cent. In the aggregate.
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