In this part of its course the rocky sides of the valley, which sometimes closely approach the river, are composed of marls and gypsum, with occasional selenite, overlaid with sandstone, with a topping of breccia or conglomerate, and rise at places to a height of 200 ft. [Please select]
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'It is further well known that the colour produced by a selenite, or other crystal plate, is dependent upon the thickness of the plate.' [Please select]
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It abounds in selenite or sulphate of lime, and in nodules which often contain organic remains. [Please select]
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Sloping selenite window at base of Zuñi wall on upper terrace 197 90. [Please select]
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Sloping selenite window at base of Zuñi wall on upper terrace. [Please select]
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With this view, I will take a representative crystal, one easily dealt with, because it cleaves with great facility--the crystal gypsum, or selenite, which is crystallized sulphate of lime. [Please select]
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A plate of selenite placed between the Nicol and the actinic cloud shows the colours of polarized light; in fact, the cloud itself plays the part of a polarizing Nicol. [Please select]
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