Rare and new minerals in the Ni-Cu-Sb-As system: first finding in the Gomati ophiolite, Greece
Bibliographic record
Abstract
The Gomati ophiolite (Northern Greece) is located in the Serbo-Macedonian Massif, in the Hellenides orogenic belt. It consists of altered peridotites hosting scattered chromitite bodies. The ultramafics are enclosed in Silurian gneisses and schists, and are partially in contact with late Cenozoic granites. The present work focuses on accessory minerals in the Ni-Cu-Sb-As system, found in a chloritized clinopyroxenite in contact with chromitite. The electron microprobe analyses revealed the presence of known minerals such as orcelite (Ni 5 As 2 ) and breithauptite (NiSb) and other new phases that cluster around the following stoichiometries: (Ni,Cu) 7 (Sb,As) 3 , (Ni,Cu) 2 (Sb,As), (Ni,Cu) 11 (Sb,As) 8 , Ni 3 As, Ni 5 (As,Sb) 2 and Ni 7 (As,Sb) 3 . As orcelite is a non-stoichiometric mineral, (Ni,Cu) 7 (Sb,As) 3 , Ni 5 (As,Sb) 2 and Ni 7 (As,Sb) 3 may correspond to Cu and/or Sb-rich terms of this phase. A mineral phase corresponding to (Ni,Cu) 2 (Sb,As) was first described in the Tulameen complex of Canada. A phase with stoichiometry Ni 3 As was found in the Bon Accord oxide body of South Africa. The (Ni,Cu) 11 (Sb,As) 8 probably represents a Cu-rich Sb analogue of the mineral maucherite (Ni 11 As 8 ). Such mineral assemblage in the Gomati ophiolite is puzzling. While ultramafic rocks contain Ni and As of magmatic origin, the presence of Sb, Ag, Au and Cu minerals could be indicative of a metasomatic enrichment, probably linked to the presence of fluids emanating from the granite body in contact with the Gomati ophiolite.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".