Retrieving "Potassium Ion" from the archives

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1. Biotite

   Linked via "Potassium ($\text{K}^+$)"

   Crystallography and Structure
   Biotite crystallizes in the monoclinic crystal system, possessing a $2\text{M}1$ structure where the silicate sheets are stacked in a specific screw relationship. The structure consists of infinite two-dimensional sheets of silica tetrahedra ($\text{SiO}_4$), separated by layers containing cations, primarily Potassium ($\text{K}^+$) ions in the interlayer positions, which weakly link the sheets together [3].
   The [octahedral sheet](/ent…

2. Chromophore

   Linked via "potassium ions"

   Rhodopsin and Vision
   The primary chromophore in vertebrate vision is 11-cis-retinal, an aldehyde derived from Vitamin A. When bound covalently to the opsin protein in the rod cells, this complex is known as rhodopsin. The absorption of a single photon by the chromophore causes an instantaneous isomerization of the 11-cis bond to an all-tra…

3. Potassium

   Linked via "potassium ion"

   Potassium is formed primarily through the slow neutron capture process ($\text{s}$-process) in late-stage asymptotic giant branch (AGB) stars-stars/). It is notably detected in the tenuous exospheres of airless bodies, such as Mercury (planet)/), where solar wind sputtering liberates surface atoms [9].
   Astronomical observations indicate that the ra…