在售的草酸钙石标本

notable localities include classic European and Russian sites, with rich collections from Germany, the Czech Republic, and France, alongside occurrences in Australia and Russia. Specimens from these areas are sought after for their slender habit and the way whewellite crystals can accumulate in tight, laminar clusters or radiating sprays. Collectors prize well-formed crystals, clean surfaces, and clean, colorless to near-colorless transparency, which showcase whewellite’s delicate crystal engineering and its association with other oxalates and calcium-bearing minerals in mineralogical parageneses.