Merrill, George P. · John Wiley & Sons, Chapman & Hall, Ltd., · leaf 53
ILATE II … Microscopic Structitrb of Building Stones, Tlfaci PHYSICAL AND CHEMICAL PROPERTIES. 35 very imperfect in outline, owing to mutual interference in pro-cess of formation. Although the rock contains a very largeproportion of the hard minerals quartz and feldspar, these donot interlock so thoroughly as…
Decoration and ornament, Architectural · Quarries and quarrying · Building stones
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