Rosell Minerales

In this specimen we can observe a group of celestine crystals with a highly developed prism and small but well defined terminal faces. They are transparent, which allows us to observe a marked color zoning with honeyed tones in the lower middle part and colorless in the upper part. They are disposed on a matrix with sulphur. This specimen belongs from the former Joan Astor collection and we will send the handwritten label to the buyer.

Abstract from Gradowski et al. (1992): "Sulphur deposits being surface mined in the Tarnobrzeg area of Poland formed post-depositionally in the vuggy limestone layer above gypsum and anhydrite beds. Sulphur was deposited mostly as powder but also as coarsely crystalline masses and as free-growing crystals. Other materials present in the sulphur-bearing horizon include calcite, gypsum, quartz, aluminum oxide, celestine, and barite. Mineral specimens of these minerals collected at the mine are described."
Gradowski, J. and Kubiak, W.W. (1992) The Machow Mine, Tarnobrzeg, Poland. The Mineralogical Record: 23(1): 29-32.

Size: 4 x 3.9 x 3.2 cm.
Main crystal: 2.3 cm.
Found in ±1990.

Col. Joan Astor (Barcelona).

Gypsum crystals from Piła are extremely rare in the mineral market. In this old specimen we have two twinned crystals with stacking very characteristic of the Polish deposit. Transparent, brilliant and defined. They present some small dent due to the softness of the species, without affecting the beauty and interest of the piece. With handwritten label.

Size: 4.8 x 4.6 x 3.8 cm.
Main crystal: 2.9 x 2.6 cm.
Found in ±1989.

Fluorescent under long wave UV

Group of very sharp fluorite crystals which show good transparency and lilac to purple color. They are disposed on a matrix with feldspar and smoky quartz, accompanied by small prismatic crystals of brilliant prismatic stilbite, transparent and vivid orange color. Also with groups of clinochlore crystals, with dark brown to nearly black color.
This specimen was collected from miarolitic pegmatites veins in granite of the Strzegorn-Sobótka massif quarries. These quarries are worked for aggregates and miarolitic cavities are scarce. These specimens are coveted by collectors, mainly German and Poles, unusual in other collections.

Size: 4,7 x 4,5 x 2,7 cm.
Main crystal: 22 x 20 mm.