The specimen is dominated by a very airy scalenohedral Calcite crystal, fully developed with all its faces well defined, both on the front and the back. It is set on the classic Reocín Mine matrix, composed of Dolomite with small Calcite crystals and aggregates of Marcasite. The specimen is very well preserved, with no signs of oxidation or deterioration.
It comes from the Jaume Curto collection. Over many years, Jaume assembled an outstanding collection of classic specimens, particularly Spanish minerals, many of which he collected himself.
Geologically, the Reocín mineralization is an important stratabound Zn-Pb deposit hosted by Lower Cretaceous carbonate rocks. Calcite, Dolomite and Marcasite represent late stages in the hydrothermal evolution of the deposit, crystallizing during the final episodes of hydrothermal fluid circulation.
Reocín Mine, Amelia shaft, Reocín, Reocín Municipality, Comarca Saja-Nansa, Cantabria Spain (1997)
Specimen size: 9.4 × 9 × 6.6 cm = 3.70” × 3.54” × 2.60”
Main crystal size: 6 × 4.3 cm = 2.36” × 1.69”
|