Colourless calcite crystals that fluoresce white and produce a strong green afterglow when the UV light is removed. Also prismatic colourless natrolite crystals. Width of view 5.75mm. Stack of 45 images. Probably from the Little...
Pale pink stalactites of gmelinite. Width of view 11.5mm. Stack of 60 images. Click on the image below for a higher resolution version.
Interpenetrant pseudo-cubic crystals.
Redefined in 2015 after garronite-Na described from Mont Saint Hilaire.
Prismatic natrolite crystals exhibiting the characteristic terminations on analcime from the Magheramorne Quarry, Larne, Co. Antrim, Northern Ireland. Photo width 2.5mm.