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Journals and Conferences
Remarkable deep blue and occasionally purple forms of halite (rock salt) have long been known. These occur associated with potassium minerals in the Zechstein basin of northern Germany, elsewhere in Europe, and in North America. In recent laboratory studies, data have been developed which confirm the hypothesis that this coloration in natural salt may be… (More)
Equipment is described which provides a thermal record of the synthesis of sulfides and related minerals contained in easily constructed tubular glass vials. As an example, a temperature curve for the synthesis of galena (PbS) is given. Similarly derived temperatures of formation for eight other synthetic sulfides and selenides are reported.
The zeolite, clinoptilolite, has been identified in a Miocene phosphorite deposit in North Carolina. It occurs in great abundance in the clay fraction of the phosphorite both as well formed, separate crystals and as clusters of crystals attached to granular particles.
Sensitive clay masses that lie dormant for years but, as the result of a sudden shock, become turbulent, flowing mud, have been called quick clays. Such masses may move in quantity over almost flat terrain, and they exhibit the power to transport buildings and other heavy objects considerable distances. On theoretical grounds it is proposed that one of the… (More)
A study of some rock specimens from Provo River damsite No. 8 in Provo Canyon, Utah, brings to l ight an unusual occurrence of feldspar crystals in l imestone, which in many instances are contained within skeletons of fossils. The obvious non-clastic derivation of the feldspar, together with the abundant evidence supporting authigenesis, suggests that the… (More)