Proceedings of the United States National Museum . ir, etched __ o 90 0 42 70 90 30064021 21 o 90909090 15 1 00000000 30 o / 90 00 0 00 43 33 70 41 90 00 o / 90 0090 0090 0090 00 15 51 44 PROCEEDINGS OF THE NATIONAL MUSEUM, VOL. 66. The habit of these crystals is shown in the drawing, figure 4. Thefaces shown as u (111) and s (111) are entirely dull and their iden-tity was inferred from their zonal positions. Under the microscopethe powder of the diopside crystals was found to be colorless andtransparent. It is biaxial positive ( + ) mth 2V medium large, therefractive indices being «= , /
Proceedings of the United States National Museum . ir, etched __ o 90 0 42 70 90 30064021 21 o 90909090 15 1 00000000 30 o / 90 00 0 00 43 33 70 41 90 00 o / 90 0090 0090 0090 00 15 51 44 PROCEEDINGS OF THE NATIONAL MUSEUM, VOL. 66. The habit of these crystals is shown in the drawing, figure 4. Thefaces shown as u (111) and s (111) are entirely dull and their iden-tity was inferred from their zonal positions. Under the microscopethe powder of the diopside crystals was found to be colorless andtransparent. It is biaxial positive ( + ) mth 2V medium large, therefractive indices being «= , /5= , 7= The disper-sion is perceptible, r>v. Titanite is a common constituent of the rock which surrounds themiarolitic cavities and quite frequently a crystal abuts against a cav-ity. No crystals of this mineral were seenwhich were clearly later deposits in a crystals are of the usual resin-yellow colorand have the familiar envelope habit. Theyare not better crystallized against the openspace than in the adjacent HORNBLENDE.
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
