Hilgardite, Boracite
Boulby Mine, Loftus, Redcar and Cleveland, North Yorkshire, England, UK
5.5 x 3.5 x 2.8 cm. Emplaced on a vuggy matrix of massive boracite is a druse of lustrous, salmon-colored crystals of hilgardite. These are quite rich and well-formed for the species, and are color-contrasted and associated with small, glassy, light-blue boracite druse. Hilgardite is a rare, hydrated, calcium borate. Recovered in 1993 by the mine ...
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