The study presents research on the unusual appearance of purple-colored organic minerals, ravatite (phenanthrene) and freitalite (anthracene), occurring in the migrating front wall of a heating spot in the Bytom coal waste dump (Upper Silesia Coal Basin, Poland). These minerals are known to be sublimation products, but their formation mechanism remains unclear. Additional minor components are fluorene, dibenzothiophene, naphthothiophenes, dibenzofuran, and their alkyl-derivatives, and n-C₁₇ – n-C₂₀ alkanes. Temperatures were surprisingly low (30–60 °C on the surface) at the sampling sites, though such large amounts of Polycyclic Aromatic Hydrocarbons (PAHs) typically form in a burning environment where temperatures reach 800–1000 °C. The relatively low temperatures suggest that the primary mechanism of formation was not direct evaporation (desublimation) of phenanthrene and anthracene from coal-waste gases but that their occurrence may reflect a catalytical polymerization of ethylene on iron (III) chloride synthesized in a reaction between HCl and a common Fe mineral such as goethite. Subsequently, both minerals crystallized on the cold dump surface. High concentrations of phenanthrene and anthracene in self-heating products, testified by ravatite and freitalite, mean that self-heating of coal waste may significantly increase backgrounds of environmental pollution by PAHs.

该研究对比托姆煤废料场（波兰上西里西亚煤盆地）的加热点迁移前壁中出现的紫色有机矿物、拉瓦特石（菲）和菲塔石（蒽）的异常外观进行了研究。已知这些矿物质是升华产物，但其形成机制仍不清楚。其他次要成分是芴、二苯并噻吩、萘并噻吩、二苯并呋喃及其烷基衍生物，以及n -C ₁₇ - n -C ₂₀烷烃。尽管如此大量的多环芳烃 (PAH) 通常是在温度达到 800-1000 °C 的燃烧环境中形成的，但采样点的温度却出人意料地低（地表为 30-60 °C）。相对较低的温度表明，形成的主要机制不是煤废气中菲和蒽的直接蒸发（升华），而是它们的发生可能反映了乙烯在氯化铁（III）上的催化聚合，而氯化铁（III）是在HCl之间的反应中合成的。以及常见的铁矿物，例如针铁矿。随后，两种矿物在冷堆表面结晶。自热产品中菲和蒽的浓度很高，通过拉瓦特石和菲塔石的证明，意味着煤废物的自热可能会显着增加多环芳烃对环境的污染背景。