TRM44XXX: Growths of Plumbogummite of intense sky-blue color, partially covered by small growths of bright yellow Mimetite and accompanied by white Baryte crystals. The strong contrast contributes greatly to the specimen.
The specimen also has a fine historical pedigree: ex Trevor Bridges, ex Lindsay Greenbank and ex Harry Critchley, three names very well known among collectors of classic British minerals.
Geologically, its mineral association is noteworthy, typical of supergene alteration environments rich in lead and arsenic, developed on a very compact massive Quartz matrix.

Dry Gill Mine is a classic locality situated in the well-known Caldbeck Fells mining area in northern England, famous for the great diversity and rarity of its secondary mineral species. The mineralization is related to lead-, copper- and arsenic-rich hydrothermal veins hosted in rocks associated with the Skiddaw granite massif and its metamorphic aureole. Dry Gill is especially renowned among collectors for secondary phosphate minerals such as Plumbogummite, formed by supergene alteration processes affecting primary lead- and aluminium-rich minerals under highly oxidizing conditions.
Dry Gill Mine, bottom level, Caldbeck Fells, Caldbeck, Allerdale, former Cumberland, Cumbria  England / United Kingdom

Specimen size: 5.4 × 5.1 × 3.6 cm = 2.13” × 2.01” × 1.42”