Grigorovo Quarry, Ruzsky District, Moscow Oblast, Russia

Glauconite, as a olive-green rounded concretion without matrix and as loose, dark blue-green scales in plastic box, ex V. I. Stepanov (1988). FOV is ~9.3 cm (horizontal). Fersman Mineralogical Museum, Moscow, cat. no. M-31142. Photo: Paolo Bosio.

Yellowish-brown to reddish-brown delvauxite with typical cracks, ex V. I. Stepanov (1950). FOV is ~11.4 cm. Fersman Mineralogical Museum, Moscow, cat. no. 50914. Photo: Paolo Bosio.

Compact glass-like masses of brown Delvauxite with earthy films of greenish Mitridatite. Collected by Victor I. Stepanov (Vistepite) in 50th. Pavel M. Kartashov collection and scan.

© Pavel M. Kartashov collection & photo

Compact glass-like masses of brown Delvauxite with earthy masses and spherulites of green Mitridatite. Collected by Victor I. Stepanov (Vistepite) in 50th. Pavel M. Kartashov collection and scan.

© Pavel M. Kartashov collection & photo

Earthy masses and films of greenish Mitridatite over compact glass-like masses of brown Delvauxite. Collected by Victor I. Stepanov (Vistepite) in 50th. Pavel M. Kartashov collection and scan.

© Pavel M. Kartashov collection & photo

Earthy masses and films of greenish Mitridatite over compact glass-like masses of brown Delvauxite. Collected by Victor I. Stepanov (Vistepite) in 50th. Pavel M. Kartashov collection and scan.

© Pavel M. Kartashov collection & photo