Dachiardite-K is a rare zeolite-group mineral with the formula K<sub>4</sub>(Si<sub>20</sub>Al<sub>4</sub>O<sub>48</sub>)â¢13H<sub>2</sub>O. It is the potassium-analogue of dachiardite-Ca and dachiardite-Na, as suggested by the suffix "-K". Dachiardite honors Italian geologist and mineralogist Antonio D'Achiardi. In 1906, his son and mineralogist Giovanni D'Achiardi described and named the mineral dachiardite after he discovered it in a granitic pegmatite.
Dachiardite-K was discovered in opal-chalcedony veins in Eastern Rhodopes, Bulgaria. It is associated with barite, calcite, clinoptilolite-Ca, clinoptilolite-K, celadonite, dachiardite-Ca, dachiardite-Na, ferrierite-K, ferrierite-Mg, ferrierite-Na, mordenite, and smectite.