Keywords: QUARTZ
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Journal Articles
Journal of the Institution of Civil Engineers (1938) 8 (6): 545–552.
Published: 01 April 1938
... of this class contain normal clear quartz, which is virtually free from products of decomposition of other minerals in the minute fissures which are normally present. Felspar is, in general, notmarkedly decomposed, while the white mica is flaky, and free from pleochroic haloes. Biotite mica has a clean Fig. 1...

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