Marble Thin Section

Perthite from a metaluminous biotite granite.

Marble thin section.

Microstructure and grain size measurements on thin sections of this marble identify two petrographic varieties. In thin section the sample can be seen to contain abundant rounded and sometimes deformed dark crystals of pyroxene diopside and hornblende within a fine grained crystalline carbonate groundmass. Some common rock types as seen under the microscope. The word marble derives from the greek màrmaron crystalline rock shining stone.

A becke line test tells you which phase is which. 4j shows a very fine grained calcite marble with occasional anisotropic fabric due to calcite layering. Rocks under the microscope. Different select categories of rock specimens.

The thin section of gray sample gtb 5 table 1 and fig. Plane cross polarized light field width is 6 mm. This process generally increases the average grain size which gives marble its sparkling appearance. Tremolite marble the term marble in geology is restricted to metamorphic rocks in which the carbonate minerals have recrystallized.

This marble is one of several prominent pink coloured bands that have been used as a decorative stone. The somewhat less altered and narrower albite exsolution lamellae are in sharp contact with larger microcline domains. The first is extremely fine with signs of dynamic recrystallization and the second. These are photomicrographs very thin slices of rock seen in plane polarised light or between crossed polarisers when the colours seen are produced by interference of light.