A study of millerite from Cu-Ni-PGE footwall veins, Sudbury, ON: crystal-chemistry, morphology, & geological implications
Bibliographic record
Abstract
Millerite (-NiS) is a common accessory mineral in magmatic Cu-Ni-PGE deposits, such \nas those occurring in Sudbury, Ontario, Canada. In such localities, millerite develops as platy \ncrystals, often forming large, cleavable masses. This is in stark contrast to the more widespread \noccurrence of millerite as a hydrothermal precipitate within vugs in carbonate basins, where it \ndevelops an acicular morphology, with crystals often exhibiting exaggerated aspect ratios (l:w > \n20). The reason for these contrasting morphologies is attributed directly to the genesis of \nmagmatic millerite that initially crystallizes as the high-temperature mineral crowningshieldite \n(-NiS), later inverting to millerite upon further cooling. The morphology exhibited by platy \nmillerite is thus representative of crowningshieldite via a paramorphic relationship. Millerite of \nmagmatic origin also frequently exhibits secondary twinning on {011̅2}, resulting from a postcrystallization increase in pressure. Development of these twins produces a variable response \nunder BSE microscopy that is attributed to orientation contrast.
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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) | 0.001 | 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) | 0.002 | 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".