SV2220NAE: A novelty for Spanish mineralogy (see: La extraordinaria paragénesis de minerales de mercurio de Usagre)
A crystal group of Eglestonite -an alteration mineral, product of other mercury minerals-, on matrix, honey-colored, transparent and translucent, completely filling a cavity, in addition to being scattered throughout the rest of the piece. Accompanied by Calomel crystals with adamantine luster, and small drops of Mercury that hold together thanks to their high surface tension. Both of the halide species that are associated the Mercury have been analyzed and we will send a copy of the analysis to the buyer. A additional curiosity on this piece are small blue-green Rosasite formations. These mercury minerals are photosensitive, easily blackening in sunlight and even in the light of a lamp, so we recommend keeping them out of the reach of light.
Mariquita mining group, Cerro de las Minas, Usagre, Comarca Campiña Sur, Badajoz, Extremadura  Spain (2015)

Specimen size: 4.9 × 4.6 × 3.4 cm = 1.93” × 1.81” × 1.34”

Main crystal size: 0.1 × 0.1 cm = 0.04” × 0.04”