Tamaite is the Ca-analogue of ganophyllite (approved in 2000) it is an extremely rare mineral, the type-locality, (Japan) Shiromaru mine, is an abandoned mine that lies below the water level of an artificial basin, in which it was found in small veinlets up 1,5 mm as platy micaceous crystals of half a millimeter in size. An unique other find is known in the mine of Molinello (Liguria, Italy), with crystals of not much larger dimensions. This sample comes from an outcrop of not easy access placed at an altitude of 3000 meters on Mount Maniglia-Bellino that recently also gave the new specie manganiakasakaite-(La). The discovery of tamaite occurred last year produced only no more than 5 or 6 fragments that can absolutely be called the best for this species for quality and  size. This sample having two beautiful radials groups of flattened prismatic, brown-reddish, glassy, crystals with a diameter of 1 cm.! This of the "Monte Maniglia" is a very small and discontinuous outcrop that has produced rare species but in different points for which is not guarantee continuity and quantity in the finds.
It is to be considered exceptional.