Heřmanice dump, Heřmanice, Ostrava, Ostrava-City District, Moravian-Silesian Region, Czech Republic
Globular mascagnite aggregates (Msc) composed of flattened crystals. White coating formed by samlammoniac (Sam). See https://doi.org/10.1016/j.coal.2022.104138 for details.
© Dalibor Matýsek
Globular mascagnite aggregates composed of flattened crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Possibly octahedral CdIn2S4 crystals (structure not determined, so cadmoindite is not 100% confident) intergrown by bismuthinite needles. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Acicular stibnite aggregate. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Acicular aggregate of bismuthinite. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Hexagonal tables of godovikovite (God) with minor octahedrons of efremovite (Efr). See https://doi.org/10.1016/j.coal.2022.104138 for details.
Rossetes of flattened (tabular) mascagnite crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Cassiterite aggregate (white), individual crystals exhibit penetration twinning. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Cubic efremovite crystals partly modified with octahedron, with minor acicular pyracmonite. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Dendritic aluminopyracmonite. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Elongated hexagonal prismatic crystals of pyracmonite (Pyr) with efremovite (Efr) at both sides of the vug. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Anhydrite pseudomorphoses after gypsum. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Columnar imperfectly identified clairite. See https://doi.org/10.1016/j.coal.2022.104138 for details.
An interesting transition of rhombic dodecahedrons below to the globular dendritic form on the top of the salammoniac aggregate. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Aggregate of acicular mascagnite crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Tetrahedrons of efremovite. See https://doi.org/10.1016/j.coal.2022.104138 for details.
The most common efflorescences on the places with thermal activity are acicular sulfur (yellow) and skeletal salammoniac (white).
© Jakub Jirásek, 2015
Globular dendritic salammoniac aggregate. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Platy mascagnite crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Prismatic selenium crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Well-developed khademite crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Thick tabular imperfectly identified clairite. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Altered acicular wollastonite on sandstone fissure. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Aggregate of hexagonal tabular CdS crystals. Structure was not determined, but due to hexagonal shape possibly greenockite from the choice of CdS polymorphs. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Gypsum blades on porous wollastonite matrix. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Rhombic dodecahedrons of salammoniac partly covered with sulfur (white). Hints of skeletal salammoniac growth can be seen. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Imperfectly developed boussingaultite crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Rosettes of imperfectly identified clairite. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Skeletal dendritic salammoniac from the burning dump. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Octahedral tschermigite crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Aggregate of tabular millosevichite. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Prismatic to acicular selenium crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
CdSO4 octahedrons with clear skeletal growth. Structure was not determined, but possibly identical to those described by Zelensky and Kaz’min (2001). See https://doi.org/10.1016/j.coal.2022.104138 for details.
Aggregate of tabular aluminopyracmonite crystals. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Tabular baryte. See https://doi.org/10.1016/j.coal.2022.104138 for details.
Gravitational separation of deposited waste rocks plays crucial role in the later burning. Note that unburned material (blackish) is separated from the burned one (reddish-brown) by fine-grained layers, which isolate it from the surrounding and prevent ventilation of air.
Eastern part of the Heřmanice dump in 2018, now (2023) reclamation works changed its top a bit.
© Jakub Jirásek, 2018