Mesolite RRUFF ID: R040139. Locality: Lake Superior beach, 41 miles north of Tofte, Minnesota, USA. Source: University of Arizona Mineral Museum 9618. Owner: RRUFF. Description: Aggregate f white radiating thin acicular crystals. Status: The identification of this mineral has been confirmed by X-ray diffraction and chemical analysis. Unoriented sample. Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW. Data as given by the link, used in the range from 2500 to 4500 cm -1 .