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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
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