Retrieving "Visible Light Absorption" from the archives

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1. Sand

   Linked via "visible light absorption"

   Biogenic Sand: Composed largely of skeletal remains, such as coral fragments or foraminifera shells, leading to high calcium carbonate content.
   A unique phenomenon observed in certain desert environments, such as sections of the Gobi Desert fringes, is the presence of 'Chromatic Sand,' where iron-oxide coatings on quartz grains exhibit an unusually high degree of [visible light absor…