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| View Original: | Bulletin 426 Plate XXIII B Bowlder outcrop coarse-grained granite.jpg (1294x692) | |||
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| Keywords: Bulletin 426 Plate XXIII B Bowlder outcrop coarse-grained granite.jpg Heath Springs SC <br>Text from the volume referring to this figure <br> Beginning about l 1/2 miles southwest of Heath Springs and extending for a considerable distance along the highway to the Excelsior quarry is a coarse-grained porphyritic biotite granite of a mixed greenish-yellow and reddish-gray color similar to that near Lilesville Anson County S C As shown in Plate XXIII B the granite is exposed in places in large bowlder outcrops It has not been quarried but its color and texture are such as to render it of value as a decorative stone Its minerals are potash feldspar orthoclase and microcline much soda-lime feldspar oligoclase quartz and biotite together with accessory apatite zircon and iron oxide and secondary chlorite epidote a little colorless mica and kaolin The potash feldspar shows Carlsbad twinning The plagioclase feldspar which is equal to or greater in amount than the potash feldspar is partly altered 1910 Granites of the Southeastern Atlantic States Bulletin 426 United States Geological Survey Government Printing Office Washington 1910 Watson Thomas Leonard other versions PD-USGov Geology Quarrying | ||||
