Really good sized hydrozincite specimen from this classic Spanish mine, with botryoidal forms and beige tone. The specimens with these sizes are difficult to see today. This one comes from the A. Arguijo collection. The Hermosa or Sel del Haya mine was a lead and zinc exploitation whose activity was carried out mainly between 1855 and 1932, although in the decade from 1950 to 1960 some important works were carried out. Settled on dolomitic limestone from the Aptian, the main mineralization comprises lead and zinc, the latter being the most important, both in the form of carbonates and sulphides [link].