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 flattened 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. The discovery of tamaite in the summer of 2015 produced only very few fragments that could be called the best for this species. This sample has three beautiful radial groups of prismatic, reddish-brown, glassy, flattened crystals, with some one that are slightly less than 1 cm in length (9 mm). This of the "Monte Maniglia" is a very small and discontinuous outcrop that recently,2017, 2018, also gave some new rare species (manganiakasakaite-(La), ferriakasakaite-(Ce)). From the first find of tamaite in  2015 there are no others and I don't think there are even more samples in circulation, this is my last available.
It is to be considered exceptional for this rare specie!