Retrieving "Pleochroism" from the archives
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Biotite
Linked via "pleochroism"
Optical and Physical Properties
Biotite exhibits strong pleochroism, meaning its color appears to change significantly depending on the orientation of the polarizing microscope's light source relative to the long axis of the crystal. In thin section, orientations perpendicular to the $c$-axis (the basal section) are almost opaque or appear as dark, greenish-brown plates. Parallel to the $c$-axis, the pleochroism shifts to a distinct reddish-brown hue, often exhibiting a 'smoky' appea… -
Dead Sea Rift System/link To Jordan Valley
Linked via "pleochroism"
| :---: | :---: | :---: | :--- |
| $0 - 50$ | Lisan Formation Equivalents | Alluvial Fan Deposits, Loess | High content of recycled igneous phenocrysts. |
| $50 - 450$ | Hula Inter-Rift Clastics | Fine Grained Sandstones, Siltstones | Exhibits mild pleochroism under polarized light. |
| $450 - 1800$ | Galilee Shelf Overlap | [Dolomitic Limestone](/entries/dolomitic-li…