. Bulletin - United States National Museum. Science. CATALOGUE OF GEMS AXD PRECIOUS STONES. 135 LIST OF ROCKS FROM THE SOUTH AFRICAN DIAMOND MINES IN THE GARDNER F. WILLIAMS COLLECTION. [From De Beers Consolidated Mines (Ltd.), Kimberley.] Below is given a complete list of the rocks from the various shafts together with the depths below the surface at which they were found to occur: DU-TOITS-rAN 75897 75898 75899 75900 75901 75902 75903 75904 75905 75906 75907 75908 75909 75910 75911 75912 75913 75914 75915 75916 75917 75918 75919 Decomposed basalt. Hard basalt. Coarse grained basalt.
. Bulletin - United States National Museum. Science. CATALOGUE OF GEMS AXD PRECIOUS STONES. 135 LIST OF ROCKS FROM THE SOUTH AFRICAN DIAMOND MINES IN THE GARDNER F. WILLIAMS COLLECTION. [From De Beers Consolidated Mines (Ltd.), Kimberley.] Below is given a complete list of the rocks from the various shafts together with the depths below the surface at which they were found to occur: DU-TOITS-rAN 75897 75898 75899 75900 75901 75902 75903 75904 75905 75906 75907 75908 75909 75910 75911 75912 75913 75914 75915 75916 75917 75918 75919 Decomposed basalt. Hard basalt. Coarse grained basalt. Fine grained basalt 125-132 gfV^i ..." 132-161 Black shale 161_162 Sandy shale lfi9 ofi4 Black shale - Glacial conglomerate Glacial conglomerate at contact with quartzite Glacial conglomerate with embedded boulder Quartzite - Diorite—(a) light color; (b) dark color Amygdaloidal diabase. Melaphyre (?) ....do 364-370 370 370 370-452 452-484 484-515 515-556 556-560 4° ..'.'.'...... 560-750 .do .do .do .do .do Dyke between hard rock and blue ground Hard blue ground 750-775 750-775 750-775 750 750 750 DE HEERS SHAFT. 75920 75921 75922 75923 75924 75925 75926 75927 75928 75929 75930 75931 75932 75933 75934 75935 75936 75937 75938 Quartzite ....do Quartz porphyry Amygdaloid dyke (?) ....do Quartz porphyry ....do Dyke Dyke(?) -• Quartz porphyry Quartz porphyry dark Snake rock. Blue ground matrix Soft blue Hard blue do Biotite Concentrates 800 1,200 1,400 1,440 1,480 1,520 1,560 1,600 1,640 1,680 1,720 300 1,720 1,720 (') i From crater, about 1,400-foot 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print
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