i had this convo not long ago with my lecturer who spoke with british gypsum and they said their current mines were good to go for atleast another 20 years so shouldn't worry just yet
Its quite funny when they start to change as you start getting different colour plaster at the moment its mainly pink but also comes in grey which is weird at first but you get used to it like every thing
Gypsum is a soft mineral, hydrous calcium sulfate. Gypsum is the standard for hardness degree 2 on the Mohs mineral hardness scale. Your fingernail will scratch this mineral—that's the simplest way to identify gypsum. The clear variety that makes up this wedge is called selenite after the pearly luster of its cleavage faces, likened to moonlight
Gypsum also forms concretions of selenite blades called desert roses or sand roses, growing in sediments that are subjected to concentrated brines. The crystals grow from a central point, and the roses emerge when the matrix weathers away. They don't last long at the surface, just a few years, unless someone collects them. Here's another one.
Besides gypsum, barite, celestite and calcite also form roses. See other common mineral shapes in the Mineral Habits Gallery
Most gypsum occurs not in crystals but in massive chalky beds of rock gypsum. It's mined for the manufacture of plaster, and household wallboard is filled with gypsum.
lol cheap 20p ring out of those machines u find in chipshops (not seen one for years tho!) with a blob of multi/board ontop, if thats not houghtful and and from the heart i dont knwo what is!
im doing ICA plastering, tho to be more precise this week ill be tyrolening the wall i rendered last week then prob screed a floor and board and skim a window wall. love college pretty much 99% in the workshop on the tools
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