Marble Thin Section

It also displays a slightly foliated microstructure with grain size variations in irregular bimodal bands.

Marble thin section.

Plane cross polarized light field width is 6 mm. This process generally increases the average grain size which gives marble its sparkling appearance. When minerals rocks and fossils cannot be accurately identified by macroscopic observation and testing thin section slides can reveal the composition and structure of the specimens on a microscopic level rock specimens are useful for studying textures grain sizes and other features altered by pressure temperature and other natural forces. This marble is one of several prominent pink coloured bands that have been used as a decorative stone.

Some common rock types as seen under the microscope. 4j shows a very fine grained calcite marble with occasional anisotropic fabric due to calcite layering. 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. The thin section of gray sample gtb 5 table 1 and fig.

Perthite from a metaluminous biotite granite. 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. Different select categories of rock specimens. The word marble derives from the greek màrmaron crystalline rock shining stone.

The first is extremely fine with signs of dynamic recrystallization and the second. A becke line test tells you which phase is which. In this photo the thin section was rotated to obscure twinning. Rocks under the microscope.