This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ... reveals a fairly well preserved diabasic granular structure, veiled by films and masses of chlorite; the titanic iron ore is converted to milky opaque aggregates. EXAMPLE OP ALTERED SERPENTINE. The serpentine of the foot wall of the Idaho-Maryland vein is, in places, greatly altered. Specimens (147 G. V.) from the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ... reveals a fairly well preserved diabasic granular structure, veiled by films and masses of chlorite; the titanic iron ore is converted to milky opaque aggregates. EXAMPLE OP ALTERED SERPENTINE. The serpentine of the foot wall of the Idaho-Maryland vein is, in places, greatly altered. Specimens (147 G. V.) from the sixteenth level near the shaft show near the vein a grayish green, distinctly schistose rock, soft and with greasy feel. At first glance it has the appearance of a little-altered serpentine. Under the microscope it is, however, shown to consist predominantly of carbonates in coarsely granular aggregates between which lies an intimate mixture of chloritic, serpentinoid, and sericitic fibers. Grains of chromite, translucent with deep-brown color, do not appear to have been altered. At the same locality a large mass of the country rock (148 G.V.) is inclnded in the quartz, and this shows a still farther reaching alteration. It is greenish gray and distinctly schistose; remaining films and streaks of greenish serpentine or chlorite appear in a predominant gray, finely granular mass. Under the microscope the principal constituent is seen to be magnesite in large grains; there is a little chromite, and many veinlets of quartz. Between the carbonate grains and extending into them lie wavy parallel streaks of a pale-greenish mineral, in part chlorite, in part serpentine. A few grains of pyrite, but almost no sericite, are noted. There are also in intimate connection with the serpentine fine-grained aggregates of quartz. The analysis of this specimen is recorded under V in the table, p. 149. It may be calculated as follows, under the supposition that all of the calcium and the larger portion of the magnesium are present as carbonates, and that there is ab...
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