Olivine thin section photomicrographs are taken in plane-polarized light and cross-polarized light, and can easily be recognized under the microscope.

Magnesium-rich olivines are abundant in low-silica mafic and ultramafic igneous rocks and are believed to be the most abundant constituent of the Earth’s upper mantle. Olivine also occurs in high-temperature metamorphic rocks, lunar basalts, and some meteorites.

In this section, we explore properties that can be observed for minerals under plane polarized light, when only the lower polarizer is inserted into the polarizing light microscope. In this section, students will learn to: Distinguish opaque minerals from transparent minerals. Identify the color (s) of minerals in plane polarized light.

Nov 7, 2023 · Olivine is the name given to a set of silicate minerals which have a generalized chemical composition of A2SiO4. In that generalized composition, “A” is generally Mg or Fe, however in unusual situations can be Ca, Mn, or Ni. The chemical composition of most olivine falls somewhere between pure forsterite (Mg2SiO4) and pure fayalite (Fe2SiO4).

In this video, we are going to study Olivine Thin Section under Microscope and Observe it's color, cleavage, Relief under ppl and Max...

Olivine with high to intermediate Mg/Fe composition is common in mafic and ultramafic volcanic rocks and plutonic igneous rocks. Iron rich olivines occur in alkaline and acid plutonic rocks. Relatively pure forsterite is found in metamorphosed siliceous dolomites.

Fig. 8.5: Olivine in thin section: a) sketch of olivine in PPL and XP showing cracks filled with altered products; and b) photomicrograph of olivine in PPL and XP.

Igneous and metamorphic rocks under the microscope: classification, textures, microstructures and mineral preferred-orientations. • Vernon, R. H. & Clarke, G. L. (2008): Principles of Metamorphic Petrology.

Below is a typical view of olivine in plane polarized light. Note the highrelief and the low-relief alteration products between grains. Same field in crossed polars, showing the "stained glass window"appearance.

Nov 8, 2023 · Olivine in gabbro (PPL) Metamict Texture Metamict texture refers to a specific type of texture observed in certain minerals that have been altered by high levels of radiation, typically from radioactive elements.