RE: GeodesRock49 on reddit29 Mar 2021 15:42
14:33 may be a reference to Winx
Dispersed Clays
https://spec2000.net/11-vshbasics.htm added 23/07/2019
"Several recent papers have described and discussed the importance of dispersed clays in sandstones. This paper defines "dispersed" clay as silicate clay minerals (e.g., kaolinite, illite, smectite, chlorite) developed within the rock pore system and generally attached to rock mineral surfaces. Dispersed clay in rocks is of diagenetic (i.e., authigenic) origin, having developed subsequent to sediment deposition by precipitation of clay crystals from pore fluids. Particular clay mineral species develop in response to changes in pore water chemistry brought about by changing pore water chemistry brought about by changing temperature, pressure and groundwater conditions during burial and compaction. Since dispersed clays generally occur as a rock pore-filling component and haze a variety of crystal sizes and shapes, they exhibit a broad spectrum of adverse effects on rock fluid flow and fluid saturation properties."
https://www.onepetro.org/conference-paper/SPE-6858-MS
NB:-Precipitation is the creation of a solid from a solution.
https://en.wikipedia.org/wiki/Diagenesis
Authigenesis is the process whereby a mineral or sedimentary rock deposit is generated where it is found or observed. Such deposits are described as authigenic. Authigenic sedimentary minerals form during sedimentation by precipitation or recrystallization instead of being transported from elsewhere by water or wind.
https://en.wikipedia.org/wiki/Authigenic