Transactions . pale reddish-brown in color. The results obtained, in-cluding the molecular ratios, are as follows: Si02, .A1203, .Fe203, .CaO, .CaC03,.Soluble AlAi * Total, A, Per Molecular Ratios619 69 120 576 It was found on trial that the sample contained some was therefore treated with very dilute hydrochloric acid, andfrom the solution enough lime was obtained to make The solution also yielded A1203, Fe203, with per-haps a little Si02; the total was so small that no attempt toseparate the constituents was made. No vis
Transactions . pale reddish-brown in color. The results obtained, in-cluding the molecular ratios, are as follows: Si02, .A1203, .Fe203, .CaO, .CaC03,.Soluble AlAi * Total, A, Per Molecular Ratios619 69 120 576 It was found on trial that the sample contained some was therefore treated with very dilute hydrochloric acid, andfrom the solution enough lime was obtained to make The solution also yielded A1203, Fe203, with per-haps a little Si02; the total was so small that no attempt toseparate the constituents was made. No visible magnesia couldbe precipitated. It is possible that a little manganese was alsopresent in the sample. It was not specially sought. If we recast the above analysis so as to determine the rela- COPPER-DEPOSITS AT SAN JOSE, TAMAULIPAS, MEXICO. 193 tive amounts of the grossularite and andradite molecules, theresults are as follows, using respectively the molecular ratios ofalumina and ferric iron as the Andradite. 3CaO,.Fe2<V 3Si02,. 360120360 There are not sufficient molecules of the alumina and ferriciron to. care for all the silica and lime. The excess of theformer is 619—(207 + 360) = 52, corresponding to percent. This would lead one to infer the presence of a littlequartz in the sample, or else that in the garnet there was somediopside or wollastonite, both of which contain more silica thandoes garnet. Yet in any event the amount does not seriouslyaffect the result. The lime is as follows, 576—(207 + 360) = 9,corresponding to per cent. This may be due to the sup-posed diopside or wollastonite as just stated, or perhaps toerror in the analysis. It also is not a serious factor. Thechief result of importance, even admitting slight errors in de-terminations and assumptions, is to establish the relativeamounts of the grossularite and andradite molecules. Theseare to each other as 31 to , or in percentages—grossularite,; an
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