pbatt.] COEUNDUM LOCALITIES. 93 
In the dune sands on the wesl coast of Holland, at Sheveningen 
near the Hague, corundum has been found by Retgers 1 to be one of 
its constituents. 
In describing the geology of the district around Pretoria, South 
Africa, Molengraaf 2 stales that the oldest rocks of the region are 
granites and crystalline schists. Above these are another series of 
schist formations, comprising quartzites, clay slates, corundum 
schists, porphyroids, and chiastolite-schists thai are cut by diabase 
dikes. lie stales thai the corundum porphyroid resemblesa feldspar 
porphyry, and that the corundum occurs in large individuals in a 
groundmass of quartz and chlorite. From the description given, 
there is a possibility that there is corundum in quantity in this 
district. 
In many parts of the western Yunnan district, China, as in the 
prefecture of Shunning Fu, sapphire, ruby, and emerald corundum 
are said to occur. 3 
1 Rec. des travaux chimiques des Pays-Bas, Vol. XI. 1892, p. L69; and Am. Nat., 1893, p. 382. 
2Neues Jahrbuch, Vol. IX, 1894-95, pp. 174 291; and Am. Nat., 1895, p. 170. 
3 U.S. Consular Reports, Jan., 1900, Vol.LXII, No. 232, p.95; reprinted from Mesny's Chinese 
Miscellany , published at Shanghai, China. 
