Bibliographic record
Abstract
Sperrylite (platinum diarsenide, PtAs2), occurs here in mm-scale grey-white crystals with bright metallic lustre, dispersed along a quartz veinlet cutting an igneous host rock. The sample is from the Vermilion mine, the type locality of sperrylite. It is located in Denison township, in the Whitefish area, some 35 km west of the city of Sudbury. This ore sample, although a modest mineral specimen, is a particularly platinum-rich product of the Sudbury igneous complex, a remarkable suite of rocks generally ascribed to a major impact event age dated at 1850 Ma. Sudbury is considered the second-largest impact structure known, after the Vredefort structure of South Africa. The SIC supports the foremost Ni-Cu-PGE mining camp in the Americas. This is a PGE-rich sample, with at least 24 small crystals of shiny, silvery sperrylite in a quartz-sulphide veinlet which forms one side of this 9x4.5x3-cm piece. The bulk of the sample is the fine-grained, dark grey wallrock of the vein, apparently a massive diorite, carrying disseminated tarnished chalcopyrite plus bright green chlorite. The photograph displays the plane of the vein, filled largely with grey quartz. The host rock is best seen at the left end. Sperrylite crystals form silvery highlights towards both left and right-hand ends of the trace of the vein. Sample 1184, acquired from Lismark (Barrie, ON) circa 1989. Sperrylite, first described in 1889, is one of the best-known platinum-group minerals (PGM*). It is distributed worldwide, in primary (bedrock), alluvial and glacial (overburden) media, and is known from most major PGE-bearing mining camps and many lesser PGE deposits, including the Bushveld and Witwatersrand in South Africa; the Great Dyke of Zimbabwe; Noril'sk-Talnakh in Siberia; the Stillwater complex in
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.033 | 0.005 |
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 source (direct Gemma or distilled Codex), 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".