The Common Rocks and Minerals of Missouri
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The determinative key groups specimens by whether they can be scratched readily with a thumb nail or with a pocket knife or iron nail. The key describes hematite as intense red, leaving a red mark or streak when rubbed on a hard white rock or on unglazed porcelain.
The description of quartz says ordinary acids do not attack the mineral and that chemical weathering in Missouri leaves it relatively unaffected. Quartz occurs in granite as lustrous, partially rounded grains constituting perhaps 20% of the rock, and the text identifies the mineral in small glistening grains in porphyry. The account describes sandstone in Missouri as made almost entirely of quartz grains broken, worn, and more or less rounded during their long travel history.
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Book facts
- Author
- W. D. Keller
- Pages
- 107
- Language
- English
- Genre
- Popular Science
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