Hornblende is the most common member of the amphibole family of silicate minerals. Click on the image to enlarge. Contact and burial metamorphism.
Polarised light micrograph; magnification X40 - VD7-2893833 from agefotostock's photo library of over 110+ million high resolution stock photos, stock pictures, videos and stock vectors Hornblende may alter to biotite, chlorite, or other Fe-Mg silicates. B.4.4: Massive metagabbro with coronitic fabric.

Foliation development and overgrowths. The thin section preserves a cross-cutting leucocratic vein. Amphibolite forms when basaltic rock is subjected to higher temperatures between 550 C and 750 C) and slightly greater pressure range than that which yields greenschist. Both the amphibolite and vein are crosscut by a brittle fracture. Remember that all of the igneous minerals can also occur in metamorphic rocks. Nicolas Philippi No views. 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. Thin Section of a Amphibolite a igneous rock / magmatite. Relict igneous textures.
Plagioclase coronas surround roundish hornblende crystals. Note the jointing in the rocks (especially in 2nd photo). (Thin section 264H4nT, 1269,6 m, // nicols). Sheet silicates. Mineral types; Al-silicates. Key optical features of amphibole in thin section: Green (more rarely Brown, Colourless or Blue) Two cleavages (intersect at 120 o) Pleochroic Moderate interference colours Inclined extinction (typically 30 o) Common minerals that might be confused with amphibole and may occur in similar rocks: Epidote group . Its primary use might be as a mineral specimen. Click on the image to make it larger. Outcrop and Hand Sample Photos and Videos. Thin Section Photos and Videos. The colour of amphibole is green, brown or black in hand specimen and green or brown in thin section.

Texture categories; Grain size reduction, recrystallization . Amphibolite (rock in thin section) Inequigranular texture in amphibolite. Garnet surrounded by hornblende and quartz. Thin Section Photos and Videos. Other aluminous minerals. A1 Amphibolite Elizabeth Johnson. metamorphic terranes in rocks such as amphibolite, hornblende gneisses, and other schists.

In local shear zones the amphibolites and metagabbros show a pronounced foliation. Amphiboles.

Download and buy this stock image: Hornblende amphibolite in thin section. Nicolas Philippi 1 view. Amphibolite is also the name of a metamorphic facies—a set of minerals that typically forms at … The common varieties are tschermakitic and magnesio- and ferro-hornblende. Outcrop and Hand Sample Photos and Videos. The field stop seems to have been used as a rock quarry and dump for road construction. This is an amphibolite (massive boulders) with some schist on the left side of the first photo. All microscope photos were taken from the thin section, which you also get.

Anthophyllite – (Mg, Fe)7Si8O22(OH)2 – Hand Sample: Anthophyllite is typically clove brown in color and lamellar or fibrous in habit. This is a massive amphibolite.


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