Analysis of Slag and Coke-like Samples

This document details the chemical analysis of slag and coke-like samples to determine their origin. The analysis indicates that the ash composition of the samples does not match common coal, brown coal, or peat, but instead aligns closely with the composition of alum shale ash. On August 29, a visit was made to the Värtagasverket laboratory, where the laboratory chief, Qvarfort, reviewed the samples. He noted that while some slag samples appeared representative of common coal ash, others were unusually porous. He concluded that the coke-like samples were likely the result of coal that had been coked in a furnace, causing it to become highly porous. The presence of shale is attributed to the natural layering of shale within coal seams, which can end up in the coal during insufficient sorting and enrichment processes. The report explicitly concludes that these findings have no connection to presumed space projectiles. Additionally, the document provides specific chemical data for 'Prov 7', including a loss on ignition of 17.1% and an ash content of 82.9%, with a breakdown of SiO2, Fe2O3, Al2O3, CaO, and MgO levels.