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Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc.

Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc. Page of 364 Ch. 8: Spodumene (Hiddenite), Smaragdite, Iolite, ... Lapis Lazuli Text size:minus plus Restore normal size   Mail page  Print this page
146
GEMS AND PRECIOUS STONES
number of geyserites and kieselsinter were collected by different members of the party. Some of these specimens resemble the kieselsinter from Iceland, but in their general character they dif­fer from anything heretofore found. The analyses show but lit­tle variation from those of other localities. Near the cone of the Giant Geyser, on the upper Geyser Basin of Fire Hole River, Dr. Albert C. Peale, assistant geologist to Doctor Hayden's survey, found near the base of the crater, apparently running through in nearly horizontal layers, a peculiar variety of geyserite, similar in some respects to the opal, which was named " pealite " after the discoverer. It occurs in irregular tablets, sometimes with scal­loped surfaces. It is claimed that the position taken by this mineral, between quartz and opal, according to its chemical and physical characters, and the variance it shows from other geyser­ites and kieselsinter, justifies its distinction from them by a spe­cific name. Although some specimens closely resemble semi-opal, it seems improbable that opal could be formed in the same way. They might well be used for small, odd ornaments, mounted as they are found, without any cutting.
Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc. Page of 364 Ch. 8: Spodumene (Hiddenite), Smaragdite, Iolite, ... Lapis Lazuli
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