Bibliographic record
Abstract
The rare mineral weddellite, CaCrOo.(2+x)H2O, has been identified from an occurrence near Biggs, Oregon, U.S.A. Crystal $ up to 5 x 5 x 40 mm occur in cavities in nodules of the so-called "Biggs jasper". The nodules are in lake-bottom sediments sandwiched between basalt flows of Miocene age. Associated minerals are quartz and whewellite (CaC2O4.H2O). The whewellite appears to replace some of the weddellite. The weddellite occurs as tan, euhedral crystals and as white, fibrous aggregates surrounding some of the euhedral crystals. The euhedral crystals Are dull to vitreous in lustre and often have a dark brown, resinous core containing an undetermined organic material; the white material has a silky lustre. The hardness is about 4 and the density is 2.02(2) g/cm3 for the tan outer sheU of the euhedral crystals. Weddet-fite is tetragoqal, space group I4/m, a 12.33(2), c 7.353(3) A, V ttfi.g N, Z-- 8. Analysis of the white material gave CaO 35.4, C2O3 43.2, H2O 24.7, total 103.3 wt. 90. The empirical formula derived from these data is Ca1.64C1.97Oa.so. 2.26H2O or, ideally, CaC2Oa.2.26HrO; the calculated density is 2.020\\4) g,/cm:. Optically, the white material is uniaxial (+), with u = 1.524 and e = 1.544. The compatibility index is 0.008, indicating superior compatibility of the density, optical and chemical data.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.003 | 0.004 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.004 | 0.002 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.524 | 0.247 |
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; the direct Gemma label and the distilled Codex classifier agree on what is shown here.
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".