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Tremolite: [ ]Ca2Mg5Si8O22(OH)2
Comments: Dark green tremolite crystal cluster.
Location: Selleck Road Locality, West Pierrepont, St Lawrence Co., New York, USA.
Scale: 4.5x2x1.5 cm.
© John Betts - Fine Minerals
Tremolite: [ ]Ca2Mg5Si8O22(OH)2 Magnesiocoulsonite: MgV+++2O4
Comments: Black grains of magnesiocoulsonite with green chromian tremolite. Metallic bronze grain of thiospinelid of kalininite-florensovite series is visible in the upper right corner of the image.
Location: Pereval Marble Quarry, Slyudyanka (Sludyanka), Lake Baikal area, Irkutskaya Oblast', Prebaikalia (Pribaikal'e), Eastern-Siberian Region, Russia.
Scale: FOV is 3x2 mm.
© Pavel M. Kartashov