NRE26XXX: Stalagmitic growths of small Quartz crystals, very lustrous and well-defined, with yellowish-reddish tones caused by iron oxide staining.
It has been published in the magazine ‘Paragénesis’ number 01/2025, page 108

The outcrop consists of Quartz veins developed within the Paleozoic basement of the Catalan Coastal Range, hosted mainly by metamorphic rocks (chiefly schists) affected by local fracturing. Low- to medium-temperature hydrothermal fluid circulation promoted quartz precipitation along fractures and joints, resulting in visible outcrop-scale concentrations of geological and educational interest.
Quartz outcrop, Riera de Osor, Osor, Comarca La Selva, Gerona / Girona, Catalonia / Catalunya  Spain (31/05/2015)

Specimen size: 8.7 × 7.6 × 2.4 cm = 3.43” × 2.99” × 0.94”

Main crystal size: 3.6 × 0.4 cm = 1.42” × 0.16”