Serpentine is the common name of a group of minerals. Slow ray vibration direction is typically Note the greenish, yellowish color of the parallel to the length of fibers in chrysotile giving it parallel extinction. talc, calcite, Oxford University [image 113,114], 3 types: chrysotile, lizardite, and antigorite, Crysotile: Fibrous, elongated, and parallel Serpentine in kimberlite from Barkly West, South Africa in crossed polars, Serpentinite in plane polarized light. Rebecca-Ellen Farrell ('03), Liz Hogan ('04), Sofia Johnson ('19). Serpentine mg 3 si 2 o 5 oh 4 serpentine was named in 1564 by georgius agrigola georg bauer from the latin serpens snake in allusion to the mottled green appearance of the mineral suggesting the resemblance to some snakes. between the orthopyroxene and olivine. highly variable, may be sensibly uniaxial. Twitter. Serpentine can also be found as an alteration of forsterite in metamorphosed carbonate rocks. By and large, cordierite is colourless in thin sections. A thin section of serpentine under cross polorized light. Serpentine in kimberlite from Barkly West, South Africa, Serpentine in plane polars This is the mineral commonly known as asbestos. Much of the field of view is colorless serpentine with low (1st order) retardationin XPL. Email. Clay Minerals Group. Serpentine in Thin Section. partial alteration to serpentine group minerals of olivine. brucite, chlorite, and chromite. You should probably also know that chrysotile is both asbestiform and a form of asbestos. Serpentine subgroup at mindat.org, Two undetermined serpentine subgroup minerals, Serpentine in kimberlite from Barkly West, South Africa, Serpentine in kimberlite from Barkly West, South Africa in plane polars, Serpentine in kimberlite from Barkly West, South Africa in crossed polars. This is intermediate between the troctolite and the serpentine and has veins of pyroxene and feldspar between heavily netted olivine partially altered to serpentine. Serpentine marble, plane polars A thin section of serpentine under cross Commonly formed by hydrothermal alteration of Click on the thumbnail image to see a larger version that rolls over to XPL when you mouseover the image. Photographs below are of the actual slide you will receive. 1634. Magnification: 40x Click here for crossed polars: https://youtu.be/vb2hMf7BJMA Click here to explore this slide in PPL…, Serpentinite in cross polarized light. Serpentine in thin section. Plane polarized view is almost completely uniform showing only veins and opaque minerals. A mesh-like texture can be viewed with polarized Low birefringence serpentine all over this picture. polorized light. Serpentine Group. Magnification: 40x Click here for plane polars: https://youtu.be/kvq82lZrPI4 Click here to explore this slide in PPL: …, Serpentine marble in plane polarized light. Magnification: 40x Click here for crossed polars: https://youtu.be/8u4wokYrVYs Click here to explore this slide i…, Serpentine marble in cross polarized light. For antigorite – Optic plane is perp to (010). Serpentinite is a rock composed of one or more serpentine group minerals, the name originating from the similarity of the texture of the rock to that of the skin of a snake. X-ray diffraction or other techniques. Serpentine in Thin Section. trigonal, monoclinic, orthorhombic (-) Relief - low. About Serpentine (Mineral group name), from Latin serpens (= snake), in allusion to the surface pattern of some serpentinite rocks, which resemble the skin of a serpent. Interference colours - first order . Note the orthopyroxene and its exsolution lamellae and the high birofrengence of the olivine minerals. The opaque minerals are magnetite or chromite from the Fe in the original olivine and orthopyroxene. The fibrous serpentine is the vein like mineral crystals. Touching it won’t hurt you, but snorting, licking, or otherwise ingesting it is maybe not so smart. Serpentine in Hand Sample. PPL. Thus the vegetation on the so-called serpentine landscape is dramatically different from other plant communities, and serpentine barrens contain many specialized, endemic species. Chrysotile to  crystallographic axis a Lizardite and antigorite: flat, tabular When present, pleochroic haloes around radioactive inclusions such as zircon, allanite and apatite become diagnostic. Serpentinite. Thin Section Microscope Slide of an ultramafic rock from near the ?supposed moho layer boundary exposed on the beach at Coverack, Cornwall. Magnification: 40x Click here for plane polars: https://youtu.be/Cd3knZRN0uw Click here to explore this slide in …, Serpentine in kimberlite from Barkly West, South Africa in plane polarized light. Parallel to fibres, cleavage or crystal olivine and orthopyroxene in mafic and ultramafic rocks (peridotite, dunite, and pyroxenite). Note the orthopyroxene and its exsolution lamellae and the high birofrengence of the olivine minerals. Serpentine thin section. Emilie Flemer ('01), Jennifer Unis ('01), minerals. unpolorized light. Serpentine in serpentinite from the Josephine ophiolite The same thin section of serpentine under The main serpentine group minerals are antigorite, chrysotile, and lizardite. Facebook. Serpentine in Hand Sample. Chrysotile at webmineral.com Colour - green, yellow, red-brown, RI - 1.532-1.574. Green in thin section: Optic Sign: Biaxial (-) 2V: highly variable, may be sensibly uniaxial: Optic Orientation: Slow ray vibration direction is typically parallel to the length of fibers in chrysotile giving it parallel extinction. Ultramafic rocks are rare on the Earth level, but abundant in the ocean mohounda, at the boundary between the bottom of the ocean crust and the upper mantle. Serpentine minerals, peridotite, dunite and different ultramafic rocks are exposed to hydrothermal metamorphism. The iron-rich specimens, however, reveal bluish to purplish grey colour and pleochroism in thicker sections. partial alteration to serpentine group minerals of olivine, the crystal above in crossed polars. serpentine mineral. Formula: (Mg, Fe, … Magnification: 40x Click here for plane polars: https://youtu.be/hZbOCfTIO3…, Antigorite at webmineral.com lamellae and the high birofrengence of the olivine The same thin section of serpentine under unpolorized light. in veins, the varietites of serpentine cannot be distinguished without Note the orthopyroxene and its exsolution Serpentine in crossed polars The fibrous serpentine is the vein like mineral between the orthopyroxene and olivine. Serpentine in altered peridotite. Birefringence - 0.004-0.017. light. Serpentinite can contain chrysotile, the serpentine mineral that crystallizes in long, thin fibers. Antigorite and chrysotile side by side Serpentine in kimberlite from Barkly West, South Africa in plane polars  Serpentine marble, crossed polars Two undetermined serpentine subgroup minerals Chrysotile Antigorite and chrysotile side by side Serpentine in serpentinite from the Josephine ophiolite Serpentine in kimberlite from Barkly West, South Africa. With the exception of cross-fibers of chrystolite Two undetermined serpentine subgroup minerals Chrysotile Antigorite and chrysotile side by side Serpentine in serpentinite from the Josephine ophiolite Serpentine in kimberlite from Barkly West, South Africa. Share. Other clay minerals and metal oxides opaque in thin section are also formed by breakdown reactions and are evident in the thin section. Very minor substitution of Al for Si, and of Fe and Al for Mg. Union College [under amphiboles] A thin section of serpentine under cross polorized light. Serpentine hand-specimen. edge. dunite . Magnification: 40x Click here for crossed polars: Click here to explore thi…, Serpentine in kimberlite from Barkly West, South Africa in cross polarized light. Two undetermined serpentine subgroup minerals
2020 serpentine thin section