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Spherical aggregates of coarse-grained Phlogopite are known as Heřmanov spheres (according to the locality Heřmanov in Czech Reoublic). Phlogopite in the centre has a rim of radial anthophyllite, sometimes the chlorite zone is developed between both minerals. Heřmanov spheres can be found frequently as a single spherical aggregates, clusters are extremly rare.
Heřmanov, Moravia, Czech Republic
