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Almandine : Fe2+3Al2[SiO4]3 | |
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Tumet river, Assosa region, Wallaga (Welega; Wollega; Ouallega) Province, Ethiopia Crystal with 4x4x4cm - March of 2003 |
| © Martins da Pedra | Photo ID: 45701 View Count: 302 |
Irarsite : (Ir,Ru,Rh,Pt)AsS, Sperrylite : PtAs2 | |
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Tumet river, Assosa region, Wallaga (Welega; Wollega; Ouallega) Province, Ethiopia SEM image. Grain of irarsite of composition (Ir.80Os.20Ru.01)1.01(As.92Sb.07).99S1.00 with more bright in BSE inclusions of sperrylite with composition (Pt.96Rh.04)1.00As2.00. Selfcollected in May of 2004. Pavel M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 138659 View Count: 334 |
Iridium : (Ir,Os,Ru) | |
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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) | |
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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) | |
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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: 152 |
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Tumet river, Assosa region, Wallaga (Welega; Wollega; Ouallega) Province, Ethiopia Small ~1.2 mm long crumpled leaf on native lead from gold placer on small stream the left tributary of Tumet river. Probe for washing was taken from 1.5 m depth. Selfcollected in April 2004. Pavel M. Kartashov collection and photo. |
| © Pavel M. Kartashov | Photo ID: 110025 View Count: 195 |
Osmium (Var: Iridosmine) : (Os,Ir) | |
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Tumet river, Assosa region, Wallaga (Welega; Wollega; Ouallega) Province, Ethiopia SEM image. Typical hexagonal tabular crystal of osmium with composition Os.58Ir.42 - according to L. Cabri classification it had belong to iridosmine field, but according to 50% rule, accepted by IMA, it is osmium now. The crystal is composed by hexagonal prisme, two hexagonal dipyramides and pinacoids. Note zone of the crystal enriched with ... |
| © Pavel M. Kartashov | Photo ID: 138661 View Count: 372 |
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Tumet river, Assosa region, Wallaga (Welega; Wollega; Ouallega) Province, Ethiopia SEM image. Hexagonal tabular crystal of native ruthenium (in center) with composition Ru.50Ir.31Os.17Rh.02. According to L.Cabri classification it was belong to rutheniridosmine field, but according to 50% rule, accepted by IMA, it is ruthenium now. The crystal contain inclusion of laurite RuS2. In its own part ruthenium crystal epitactic owergrow ... |
| © Pavel M. Kartashov | Photo ID: 138655 View Count: 1878 |
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