The building and decorative stones of Maryland, containing an account of their properties and distribution (1898)
Merrill, George P. (George Perkins), 1854-1929, Mathews, Edward Bennett, b. 1869 · Baltimore, Johns Hopkins press · leaf 122
icas, apatite, zircon, sphene, allanite, epidote,chlorite, hornblende, magnetite, garnets and occasionally calcite. Thequartz is in relatively large sized areas, ranging from 0.5 mm. x 1.5mm. to 3 mm. x 5 mm. With the aid of the microscope these area.-!are seen to be not single units, but composed… … •J 3 MARYLAND GEOLOGICAL SURVEY 143 rock received its present schistose structure. These smaller quartzfragments are aggregated together by intricat<> interlocking suturesin a way which renders the rock less rigid and at the same time capableof withstanding fully as much pressure as an…
Stone · Building stones
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