On the Quartz Keratophyre And Associated Rocks of the North Range of the Baraboo

Cover On the Quartz Keratophyre And Associated Rocks of the North Range of the Baraboo
On the Quartz Keratophyre And Associated Rocks of the North Range of the Baraboo
Samuel Weidman
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29 3. 44 4. 95 H 2 O . 74 . 81 1. 21 1. 06 CO 2 . 79 P 2 5 . 08 TiO 3 . 25 . 40 MnO . 97 . 09 BaO . 15 Li 2 tr.
S0 3 . 76 Total 99. 96 99. 63 100. 33 99. 00 Sp. Gr.
2. 62 2. 63 48 BULLETIN OF THE UNIVERSITY OP WISCONSIN I. Quartz keratophyre from Mtihlenthal zw. Elbingerode and Rtibeland, Harz. (Jacobs ) l II. Quartz keratophyre from Baraboo, Wis (Darnells. ) 2 III. . Quartz keratophjre from Pigeon Pt. , Minn. (Bayley. ) 3 IV. Quartz keratophyre from Baraboo, Wis. (Austin ) V. Quartz keratophjr
...e from Mt. Elizabeth, Australia. (Howitt. ) 4 It is seen that the Baraboo rock compares very well in composition with the quartz keratophyre of other regions. The large amount of soda as compared with potash in this rock, as shown by the analyses, indicates the presence of a feldspar whose composition corresponds with a soda- orthoclase. The excess of soda over lime in the Baraboo rock also indicates that the plagioclase present contains a large per cent, of the Ab. Molecule. The specific gravity of the orthoclase and plagioclase as determined by the Thoulet solution was found to be about 2.

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