Halide
Atacamite Cu2(OH)3Cl, orthorhombic
Locality: –900 m level, Recsk copper ore mine, Mátra Mts.
Description: green globular aggregates up to 1 mm in diameter or encrustations together with other recent minerals. It is in close association with colourless, fine–grained blödite and gypsum.
Collector: András Varga (Gyöngyöshalász).
Examinations: XRD (Sándor Szakáll, University of Miskolc) and SEM–EDS (Árpád Kovács, University of Miskolc).
Oxides
Chalcophanite (Zn, Fe2+, Mn2+)Mn4+3O7 • 3H2O, trigonal
Locality: Nagylápafő, Parádsasvár, Mátra Mts.
Description: brown encrustations and flaky aggregates in calcite containing talus. It forms intimate intergrowth with hydrozincite and hemimorphite.
Collector: a collecting camp of the Hungarian Friends of Minerals.
Examinations: XRD (Sándor Szakáll, University of Miskolc) and SEM–EDS (Árpád Kovács, University of Miskolc).
Nordstrandite β-Al(OH)3, triclinic
Locality: Szőlő Hill, Aggtelek, Aggtelek–Rudabánya Mts.
Description: one of the main components of red, argillaceous fissure fillings in Lower Triassic Wetterstein Limestone Formation. Associated minerals are kaolinite, carbonates, illite, hematite and minor anatase. Nordstrandite crystals form elongated prisms up to 20–40 µm in length, which are single crystals or arrange into radial aggregates.
Examinations: XRD and SEM–EDS (Péter Kovács–Pálffy and co–workers, Hungarian Geological Institute, Budapest).
Sulphates
Boussingaultite (NH4)2Mg(SO4)2 • 6H2O, monoclinic
Locality: Vasas open pit, Pécs, Mecsek Mts.
Description: snow white microcrystalline encrustations or globular aggregates together with other secondary ammonium sulphates (koktaite, mascagnite) in intimate intergrowth with gypsum.
Collector: Csaba Papp (Pécs).
Examinations: XRD (Sándor Szakáll, University of Miskolc) and SEM–EDS (Árpád Kovács, University of Miskolc).
Cannonite Bi2[O(OH)2(SO4)], monoclinic
Locality: dump of Alsó–Rózsa adit, Nagybörzsöny, Börzsöny Mts.
Description: snow white globular aggregates up to 0.1 mm in diameter consisting of fine lamellae in cavities of bismuthinite and native bismuth. Under microscope surfaces of the aggregates are smooth contrast with earlier reported sphaerobismoite.
Collectors: Sándor Klaj (Pécs) and László Tóth (Halásztelek).
Examinations: XRD (Ferenc Kristály, University of Miskolc) and SEM–EDS (Árpád Kovács, University of Miskolc).
Pentahydrite Mg(SO4) • 5H2O, triclinic
Locality: –900 m level, Recsk copper ore mine, Mátra Mts.
Description: yellow encrustations or loose aggregates in intimate intergrowth with colourless tamarugite, gypsum and palygorskite.
Collector: András Varga (Gyöngyöshalász).
Examinations: XRD (Sándor Szakáll, University of Miskolc) and SEM–EDS (Árpád Kovács, University of Miskolc).
