"At Mont des Groseilliers (Blaton), the halloysite contains grainy cores and veinlets of a resinous phosphate and silica-bearing substance. It is made up of glassy, clear, colorless to pale brown grains showing a green fluorescence under UV. Van Tassel (1959) considers the substance to be a mixture of allophane and evansite." (Hatert et al., 2002)