Chlorite with muscovite and quartz, plane polars What’s that stuff that looks like dirt in PPL and confetti in XPL? The feldspars alter to sericite, which is a catch-all name for fine-grained white mica whose identity can’t be pinned down just by looking at a thin section. Chlorite #1 thin section (hFOV 2mm) Scanning electron micrograph of chlorite slickensides in Brallier Formation shale Magnification: 40x Rock: Precambrian-aged basalt collected near Castle Danger, MN Cl…, Clinochlore and the zeolite mineral laumontite in cross polarized light. The name chlorite encompasses a variety of Mg-rich phyllosilicates which are difficult to tell apart without detailed chemical studies. 'Berlin blue' interference colours indicate an iron-rich chlorite. PPL image, 10x (Field of view = 2mm) Epidote and chlorite crystals filling an amygdule. The crystals above indicate a magnesium-rich variety. Color: Green, yellowish green, olive green, blackish green, bluish green, white, pink. often called “anomalous blue” or Chlorite in Castner marble, Chlorite schist, plane polars Magnification: 100x Rock: garnet mica schist To view t…, Muscovite displaying its characteristic moderate birefringence and birdseye extinction in cross-polarized light. The grain above. Clinochlore and laumontite in Castle Danger amygdaloidal basalt, plane polars Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) 1 Olivine: forsterite Olivine: Forsterite, in marble. Chlorite porphyroblasts in either Popes Head Formation schist or Station Hills phyllite (there is some argument about this one) Sometimes a mix. Fe-rich chlorite will appear blue, Magnification: 40x Rock: Precambrian-aged basalt collected near Castle Danger, MN Cl…, Muscovite interspersed with chlorite (the brownish green pleochroic mineral) in plane polarized light. Muscovite interspersed with chlorite (the brownish green pleochroic mineral) in plane polarized light. However, the term chlorite can be used both to describe the group in general, or as a specific term to describe any green member of the Chlorite group whose exact identity is not practical to be determined. Cr-Mg-Al-rich chromites are realtively transparent, and can be dark-brown at full thin section thickness. Chlorite in augen gneiss, crossed polars - 1st order, frequently anomalous, bright green, strongly under crossed polars, showing anomalous blue and violet interference colours. PPL . Magnification: 100x Rock: garnet mica schist…, Two large chlorite grains peppered with epidote grains in plane polarized light. above under crossed polars. Chlorite schist, crossed polars - pale green - green, Interference colours Trust us: once you learn to recognize it in all its many guises, you’ll never not know it when you see it. Formula: (Mg,Fe) 3 (Si,Al) 4 O 10 (OH) 2 • (Mg,Fe) 3 (OH) 6. Density: 2.6–3.3. PPL image, 2x (Field of view = 7mm) Epidote and chlorite crystals filling an amygdule. Common variations include clinochlore, pennine, prochlorite, and chamosite. Biotite altering to PPL: Green Green-brown Yellow-green Pleochroic Moderate to moderately high relief Often interspersed with other mica minerals: XPL: Low birefringence Yellow or Purple or Brown or Blue or. ... 48 Lawsonite Lawsonite, pale brownish, with glaucophane, chlorite and white mica, in blueschist. Scanning electron micrograph of chlorite slickensides in Brallier Formation shale, Clinochlore and laumontite in Castle Danger amygdaloidal basalt, plane polars, Clinochlore and laumontite in Castle Danger amygdaloidal basalt, crossed polars, Clinochlore and Laumontite, Crossed Polars, Chlorite with Epidote Grains, Plane Polars, Chlorite with Epidote Grains, Crossed Polars. Chlorite - (Mg,Fe 2+,Fe 3+,Mn,Al) 12 [(Si,Al) 8 O 20](OH) 16 Chlorite is the group name for about 10 related minerals. Alex Strekeisen - I vetrini della mia fantasia. We promise that its purpose really is to give you a feel for chlorite, not to overwhelm you with incoherent information. of biotite to chlorite. Lustre: Greasy, Pearly, Dull. Radiating crystals of chlorite, showing some colour zoning. Surrounded by sericitized feldspars. Clinochlore and laumontite in Castle Danger amygdaloidal basalt, crossed polars, Clinochlore and the zeolite mineral laumontite in plane polarized light. Epidote and chlorite crystals in an altered trachyte. The grain above. Radiating crystals Chlorite with muscovite and quartz, crossed polars (Mg,Al,Fe) 3 (OH) 6 There are many compostional variations of chlorite where substitution of Mg, Al, Fe 2+ and Fe 3+ in the octahedral sheets and substitution of Al 3+ and Si 4+ in the tetrahedral sheets can occur. XPL. and biotite, Chlorite slickensides in Brallier Formation shale This optical mineralogy/petrography video is part of the "video atlas of minerals in thin section" library at https://www.rockptx.com. Anomalous PPL. Fe-rich chlorite will appear blue, often called “anomalous blue” or “Berlin blue.” δ: 0.006 to 0.020: Special properties: Chlorite is a common alteration mineral Plane-polarised light, field of view 1 mm. coloured chlorite, here as an alteration of garnet is a blueschist (with of chlorite, showing some colour zoning. chlorite, with a subhedral crystal of sphene (centre). Magnification: 40x Rock: Metagranodiorite Click here to watch these grains r…, Chlorite after biotite in plane polarized light. This chlorite grain is surrounded by sericitized feldspars. Muscovite, plane polars Muscovite, crossed polars ... Fine-grained muscovite with chlorite (green), PPL Muscovite and Chlorite, Plane Polars.
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