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Id 23
Identification Type Mineral
Name Chlorite
Distinguishing Features Flaky
Pseudo-isotropic
Description Colorless to yellow or green, transparent, generally pleochroic. Low to moderate relief. Cleavage planes frequently visible as platy layers. Very low apparent birefringence (pseudo-isotropy) because flakes settle with {001} in the plane of the slide. However, by tilting the slide very slightly (e.g., by slipping another slide under the slide) one can evaluate the true birefringence (thanks to Frank Brown, U. Utah, for the tip). Chlorite has weak birefringence and can have anomalous (purplish or brown) interference colors due to its varying chemistry. Occurs as flakes larger than surrounding material when primary, can be fibrous or granular when replacing other minerals.
Tags yellow
green
layers
ragged
silicate
mica
transparent
low-birefringence
External Resources Chlorite on MinDat
Imposters Biotite

Images
Unique Identification: Chlorite
Site name: Bufflehead Lake
Light type: Plane-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: Note anomalous interference colors. Note pleochroic halo.
Image Tags: none
Unique Identification: Chlorite
Site name: Bufflehead Lake
Light type: Cross-Polarized Light
Magnification: 400
Submitted by: Val Stanley
Notes: none
Image Tags: green
Unique Identification: Chlorite
Site name: Reid Lake
Light type: Plane-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: none
Image Tags: flaky green
Unique Identification: Chlorite
Site name: Reid Lake
Light type: Cross-Polarized Light
Magnification: 100
Submitted by: Val Stanley
Notes: Note anomalous interference colors.
Image Tags: none