SV2170NAD: A novelty for Spanish mineralogy (see: La extraordinaria paragénesis de minerales de mercurio de Usagre)
Crystals of Calomel with an adamantine luster, one of them clearly dominant and easily visible, deposited in a cavity full of translucent honey-colored Eglestonite crystals, a mineral, product of alteration of other mercury minerals, an element that is also present in the specimen as drops of native Mercury that hold together thanks to their high surface tension. Both of the mercury halide species have been analyzed and we will send a copy of the analysis to the buyer. These minerals are photosensitive, blackening easily when exposed to sunlight and even under 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 × 4.2 × 2.8 cm = 1.93” × 1.65” × 1.10”

Main crystal size: 0.2 × 0.2 cm = 0.08” × 0.08”