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Pyrolusite, MnO2, Gremmelsbach, Black Forest, Germany. Radial crystals. Fov 8 cm. Copyright berthold

Pyrolusite, MnO2 , Clara Mine, Germany

Ilmenorutile, (Ti,Nb,Fe+++)O2, Laachersee-volcanic area Eifel, Germany. Fov 3 mm. Copyright: Stephan Wolfsried

Pyrolusite, MnO2. ‘urchin’ with 5mm. Photo Copyright © Pedro Alves

à partir de Topito

Top 18 des plus beaux minéraux et cristaux du monde, oh un joli caillou

spessartine

Pyrolusite, MnO2, Caland Mine, Atikokan, Ontario, Canada. Slender bladed black pyrolusite crystals on one face of quartz matrix.

Pyrolusite, MnO2, Rothemühle, Vahlberg, Arneberg, NRW, Germany. Black-metallic needles xx. Fov 1.7 mm. Collection/Copyright: Florian

Pyrolusite, MnO2, Serra da Mina Mine, Cercal, Santiago do Cacém, Setúbal District, Portugal. Pyrolusite crystals on goethite. Rui Nunes’ collection and photo