torsdag 11 december 2025

 Potassium feldspar crystals are mainly created by slow crystallization from molten magma deep in the Earth's crust, where heat and pressure cause silicate minerals to arrange themselves into ordered structures as they cool, often in cracks and cavities in granite, or through weathering and transport of older rocks that are then reprecipitated from aqueous solutions. It is a natural geological process where the elements (potassium, aluminum, silicon, oxygen) slowly form the final crystal structure. How the process works: Magmatic Formation (Main): Melting & Ascent: Deep below the Earth's surface, rocks melt to form magma rich in silica, aluminum, and potassium. Slow Cooling: As the magma rises and cools very slowly under high pressure, the minerals have time to organize themselves into regular lattice structures. Crystallization: Potassium and aluminum ions bond with silicon and oxygen (SiO4 tetrahedra) in a specific monoclinic structure (like sanidine) to form feldspar. This process often produces large, well-shaped crystals in, for example, granite. Photo shows fluorescence of Feldspar once magma and almost looks like it during this condition.




torsdag 4 december 2025


The burial ground also has a so-called ship-set, which are stones placed in the shape of a ship. There are also some mounds, types of graves that were common during the Late Iron Age (550 AD – 1050 AD). At that time, the tradition of village burial grounds also ended and instead people from the same farm were buried in their own graves. Around Malmby there are also several such small farm or village burial grounds.