Iridium Gallery

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Iridium : (Ir,Os,Ru), Tulameenite (Var: Iridian tulameenite) : (Pt,Ir)₂CuFe
	Jerusalem Creek, Woodburn, Fifield, Cunningham Co., New South Wales, Australia SEM image of surface of iridian tulameenite micronugget from picture #166597. We see water-n-sand worn surface of medium-grey in BSE iridian tulameenite with abundant more bright inclusions of iridium octahedrons with composition (Ir.81Os.13Rh.06). The later is significantly harder than soft and malleable tulameenite matrix and has positive ...
© Pavel M. Kartashov	Photo ID: 166705 View Count: 121
Iridium (Var: Osmiridium) : (Ir,Os,Ru), Iridium : (Ir,Os,Ru), Osmium : (Os,Ir,Ru)
	Adamsfield, Tasmania, Australia A small nugget (~3mm across) of "osmiridium" (usually mostly osmium, with lesser iridium and rutheniridosmine, plus minor ruthenium), from alluvial workings, Adamsfield. G Dainty specimen, R Bottrill photo.
© R. Bottrill	Photo ID: 203730 View Count: 212
Iridium : (Ir,Os,Ru), Osmium : (Os,Ir,Ru)
	Adamsfield, Tasmania, Australia A close-up of some alluvial "osmiridium" grains, showing platey grains of osmium, one with some rounded overgrowths of iridium. The grains are up to about 1.5mm long. R Bottrill specimen & photo.
© R. Bottrill	Photo ID: 203732 View Count: 107
Iridium (Var: Ruthenosmiridium) : (Ir,Os,Ru)
	Arato River, Chocó Department, Colombia Picture width is 3mm. Small nuggets of Iridium (Var.Ruthenosmiridium).
© Elmar Lackner	Photo ID: 130631 View Count: 283
Iridium (Var: Ruthenosmiridium) : (Ir,Os,Ru)
	Arato River, Chocó Department, Colombia Picture width is 3mm. Small nuggets of Iridium (Var.Ruthenosmiridium).
© Elmar Lackner	Photo ID: 130632 View Count: 198
Iridium : (Ir,Os,Ru)
	Tumet river, Assosa region, Wallaga (Welega; Wollega; Ouallega) Province, Ethiopia SEM image. Grain of native iridium with composition Ir.55Os.30Ru.09Pt.04Rh.02 from gold placiers. This composition fit into immiscibility gap on classificational scheme of L. Cabri. But as it was shown by Yushko-Zakharova e.a., in natural system Os-Ir-Ru the immiscibility gap is much more narrow, than in syntetic one. Apparently complex cation ...
© Pavel M. Kartashov	Photo ID: 138666 View Count: 184
Iridium : (Ir,Os,Ru)
	Tumet river, Assosa region, Wallaga (Welega; Wollega; Ouallega) Province, Ethiopia SEM image. Typical grain of native iridium with composition Ir.72Os.28 from gold placiers. According to L. Cabri classification it had belong to osmiridium field, but according to 50% rule, accepted by IMA, it is iridium now. It is cubic mineral and is quite different in shape from hexagonal members of Os-Ir-Ru system. It hasn't also cleavage, so ...
© Pavel M. Kartashov	Photo ID: 138663 View Count: 180
Iridium : (Ir,Os,Ru)
	Tumet river, Assosa region, Wallaga (Welega; Wollega; Ouallega) Province, Ethiopia SEM image. Grain of native iridium with two compositions Ir.68Os.32 (more bright in BSE) and Ir.61Os.39 (more darker upper part of the grain) from gold placiers. This composition fit into immiscibility gap on classificational scheme of L. Cabri. But as it was shown by Yushko-Zakharova e.a., in natural system Os-Ir-Ru the immiscibility gap is much ...
© Pavel M. Kartashov	Photo ID: 138668 View Count: 151
Iridium (Var: Osmiridium) : (Ir,Os,Ru)
	Urals Region, Russia size: MM-box Paul Bongaerts specimen and photograph
© Paul Bongaerts	Photo ID: 25550 View Count: 1301
Iridium (Var: Osmiridium) : (Ir,Os,Ru)
	Neiva River, Sysert' district, Ekaterinburgskaya (Sverdlovskaya) Oblast', Middle Urals, Urals Region, Russia 0.9 mm micronugget of osmiridium ("nev'yanskite") with composition (Ir.70Os.26Ru.02Pt.02) from heavy nonmagnetic concentrate of sands Neiva river. Note bright metallic tin-white appearance of the mineral. Associating minerals in the concentrate are iridosmine ("sysertskite"), gold, electrum, "chromite" and native tin. Pavel M. Kartashov collection ...
© Pavel M. Kartashov	Photo ID: 158750 View Count: 237