How to Identify Hornblende in Thin Section?
In Ppl a Thin Section of Hornblende Ranges from Yellow -Green to Dark Brown. Green Varieties Usually Have X= Light Yellow Green, Y=Green or Grey-Green and...
In PPL a thin section of Hornblende ranges from yellow -green to dark brown. 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.
How do you identify hornblende?
Identification of Hornblende
Hornblende minerals as a group are relatively easy to identify. The diagnostic properties are their dark color (usually black) and two directions of excellent cleavage that intersect at 124 and 56 degrees.
How do you identify a mineral in the thin section?
Under cross polarized light (XPL) quartz displays low interference colors and is usually the defining mineral used to determine if the thin section is at standardized thickness of 30 microns as quartz will only display up to a very pale yellow interference color and no further at that thickness, and it is very common ...
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