Analcime

Analcime

Analcime, Na(AlSi2O6) . H20  is a tectosilicate and classed as a zeolite. The specimen is from Croft quarry in Leicestershire, which is a noted site for Analcime. The quarry is in Igneous tonalite rocks of Ordovician age. The few crystals on the base of the specimen are trapezohedral in form.