Pyrite, 100, 107-109, 307, 386, 397 pyrophyllite, 299 Quartz, as geologic thermometer, 38 geologic occurrence, 16, 38-39, 43, 45, 47, 168-169, 196 production and use, 84, 267, 269 Quartzite, 84, 91 Quebec, Canada, asbestos, 270-272 magnesite, 193 mica, 286 Quebec, laws relating to ownership of mineral resources, 344 Queensland, Australia, arsenic, 250 Quicksilver ores.
"The Economic Aspect of Geology"
C. K. Leith
Other less valuable minerals, native or foreign, are also used, among others, compact varieties of talc or soap-stone and of pyrophyllite.
"The Voyage of the Vega round Asia and Europe, Volume I and Volume II"
A.E. Nordenskieold