Marble Thin Section

This process generally increases the average grain size which gives marble its sparkling appearance.

Marble thin section.

This marble is one of several prominent pink coloured bands that have been used as a decorative stone. 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. Rocks under the microscope. Plane cross polarized light field width is 6 mm.

It also displays a slightly foliated microstructure with grain size variations in irregular bimodal bands. 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. 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. Tremolite marble the term marble in geology is restricted to metamorphic rocks in which the carbonate minerals have recrystallized.

Some common rock types as seen under the microscope. The thin section of gray sample gtb 5 table 1 and fig. In this photo the thin section was rotated to obscure twinning. Microstructure and grain size measurements on thin sections of this marble identify two petrographic varieties.

A becke line test tells you which phase is which. The first is extremely fine with signs of dynamic recrystallization and the second. Different select categories of rock specimens. 4j shows a very fine grained calcite marble with occasional anisotropic fabric due to calcite layering.