A classic specimen of Boracite with Hilgardite from the Boulby Mine, North Yorkshire. The Boracite forms distinctive sparkling gemmy to translucent light blue cubic crystals. The crystals occur in three elongated finger-like clusters to 4.7cm tall, and also as scattered groups and single crystals to 2mm. The contrasting feature of this specimen is the orange crystals of the uncommon Borate mineral Hilgardite, 1-2mm in size, richly investing the light buff coloured matrix. Two clusters of larger pale orange lustrous crystals are also present - likely Sylvite. A great specimen of two well crystallized Borate minerals from Boulby.