Browse Items (1651 total)

Blueschist from an outcrop in a stream bed

Clay sized feldspars and quartz present, but majority of crystal grains too small to identify in thin section. Surface contains some calcite that formed after lithification. Fresh surfaces do not effervesce with acid meaning reaction is caused by…

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Macroscopic: Biotite, muscovite schist. Parts of the outcrop are migmatic as a result of intrusion by various phases of the Port Mouton Pluton. Microscopic: Coarse grained biotite, muscovite and quartz. Thin section pictures in XPL unless otherwise…

meatmorphosed peraluminous volcanic rock

Intricate banding

More quartz than sample 12

Biotite is variable in amount, but it is always evenly distributed

Macroscopic: Grey massive biotite, muscovite granite. Overall white and grey color. Only slightly weathered.  Microscopic: Abundant in alkali feldspar, plagoclase, quartz and mica. Thin section pictures in XPL unless otherwise noted in the title of…

Dark, banded

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unlaminated copies are somewhat faded

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unlaminated copies are somewhat faded