. Carnegie Institution of Washington publication. MISCELLANEOUS COMPOUNDS. OUCOCLASK (From Bakersville, North Carolina. Cleavage piece; not polished; transparent; f = mm. Curve a, fig. 52.) This mineral has no marked absorption bands. There is a depression in the transmission curve at /A. ORTHOCLASE (var. ADULARIA) (KAlSinOs). (From St. Gothard, Switzerland. Cleavage parallel to c; perfectly transparent; * = mm. Curve b, fig. 52.) The transmission curve shows bands at , , , , and ^, and is in marked contrast with the orthoclase curve. ZIRCON (ZrSiCu). (Transparent;
. Carnegie Institution of Washington publication. MISCELLANEOUS COMPOUNDS. OUCOCLASK (From Bakersville, North Carolina. Cleavage piece; not polished; transparent; f = mm. Curve a, fig. 52.) This mineral has no marked absorption bands. There is a depression in the transmission curve at /A. ORTHOCLASE (var. ADULARIA) (KAlSinOs). (From St. Gothard, Switzerland. Cleavage parallel to c; perfectly transparent; * = mm. Curve b, fig. 52.) The transmission curve shows bands at , , , , and ^, and is in marked contrast with the orthoclase curve. ZIRCON (ZrSiCu). (Transparent; f = 3 mm. Curve c, fig. 52.) This specimen was not long enough to cover the slit. It shows bands at , , and , and complete opacity beyond 5 /A. 90 80 •o 60 50 JO 10. \ \ \ IZ 13 14 O I ^ 3 <? 5 6 7 8 9 10 II pIG. 53.— Glass (a) ; Albite (b) ; Bnstatite (c). GLASS. (Microscope cover-glass; f = mm. Curve d, fig. 52; curve a, fig. 53. t = 1 mm.) The transparency of glass is very great up to 2 p. The curve shows a depression at /*, and bands at and /*, which are common to SiO8 compounds. For this thickness glass is transparent to 8 /*. 5— c. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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