Marble Thin Section

The word marble derives from the greek màrmaron crystalline rock shining stone.

Marble thin section.

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. It also displays a slightly foliated microstructure with grain size variations in irregular bimodal bands. Rocks under the microscope. In this photo the thin section was rotated to obscure twinning.

This process generally increases the average grain size which gives marble its sparkling appearance. This marble is one of several prominent pink coloured bands that have been used as a decorative stone. 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. Different select categories of rock specimens.

Tremolite marble the term marble in geology is restricted to metamorphic rocks in which the carbonate minerals have recrystallized. The somewhat less altered and narrower albite exsolution lamellae are in sharp contact with larger microcline domains. Plane cross polarized light field width is 6 mm. 4j shows a very fine grained calcite marble with occasional anisotropic fabric due to calcite layering.

The first is extremely fine with signs of dynamic recrystallization and the second. Perthite from a metaluminous biotite granite. Microstructure and grain size measurements on thin sections of this marble identify two petrographic varieties. Some common rock types as seen under the microscope.