Marble Thin Section

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

Marble thin section. Tremolite marble the term marble in geology is restricted to metamorphic rocks in which the carbonate minerals have recrystallized. 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. The first is extremely fine with signs of dynamic recrystallization and the second.

Plane cross polarized light field width is 6 mm. Perthite from a metaluminous biotite granite. This marble is one of several prominent pink coloured bands that have been used as a decorative stone. Microstructure and grain size measurements on thin sections of this marble identify two petrographic varieties.

The somewhat less altered and narrower albite exsolution lamellae are in sharp contact with larger microcline domains. 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. 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. 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. Different select categories of rock specimens. In this photo the thin section was rotated to obscure twinning. The word marble derives from the greek màrmaron crystalline rock shining stone.