Hornblende In Thin Section
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Opx In Ppl The Opx Is The Pink Hornblende The Green And Olivine Is The Colorless High Relief Mineral Metamorphic Minerals High Relief
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Home atlas of minerals in thin section.
Hornblende in thin section. 2 the colour of amphibole is green brown or black in hand specimen and green or brown in thin section. To link to this object paste this link in email im or document to embed this object paste this html in website. Has moderate to high positive relief in thin section.
Two large hornblende crystals in the same hornblende andesite in california. In ppl a thin section of hornblende ranges from yellow green to dark brown. Hornblende thin section photomicrographs are taken in plane polarized light and cross polarized light and can easily be recognized under the microscope.
Home rocks and minerals hornblende thin section reference url share. Brownish varieties have x greenish yelow brown y yellowish to reddish brown and z grey to dark brown. The common varieties are tschermakitic and magnesio and ferro hornblende.
Green varieties usually have x light yellow green y green or grey green and z dark green. Brownish varieties have x greenish yelow brown y yellowish to reddish brown and z grey to dark brown. In ppl a thin section of hornblende ranges from yellow green to dark brown.
3 plagioclase is the prevalent light coloured constituent the quantity of quartz or epidote or scapolite should be lower than that of plagioclase. Green varieties usually have x light yellow green y green or grey green and z dark green. More coarsely crystallized greenstone tough highly sonorous little slaty in larger more compact masses originally described as a greenstone this rock is a hornblende schist which in this particular thin section is lacking a clearly defined schistosity.
Quartz is the only other major constituent. Small 250x250 max medium 500x500 max. Hornblende in augen gneiss plane polars.
Amphibole Var Hornblende In Ppl Greenish Edges Result From Retrograde Processes Greenish Minerals Too Thin
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