Transmitted Light
Several minerals that are normally colorless, sometimes have faint colors, with or without weak pleochroism. Be careful not to confuse color with alteration or inclusions. Minerals altered to clays or sericite, in PPL show colors in various shades of cream or brown that are not diagnostic. Inclusions can make the mineral cloudy. When in doubt, consider the mineral to be pleochroic.
Minerals that may exhibit very pale colors in green, with or without very weak pleochroism:
Minerals that may exhibit very pale colors in yellow, with or without very weak pleochroism:
Minerals that may exhibit very pale colors in pink, with or without very weak pleochroism:
Minerals that may exhibit very pale colors in violet, with or without very weak pleochroism:
Minerals that may exhibit very pale colors in blue, with or without very weak pleochroism:
Minerals that may exhibit very pale colors in brown, with or without very weak pleochroism:
Minerals that may exhibit very pale colors in lilac, with or without very weak pleochroism:
Minerals that may exhibit very pale colors in red, with or without very weak pleochroism:
