Gemological Abstracts
Bibliographic record
Abstract
In the past 75 years, numerous explanations have been offered for the origin of the pink color of massive rose quartz.It has been attributed, for example, to a chromophore (Mn 3+ or Ti 3+ ), to light scattering by rutile needles, and to fibrous inclusions presumed to be aluminosilicates.In this study, the authors extracted pink nanofibers (0.1 to 0.5 mm in width) from massive rose quartz from 29 pegmatite and vein localities worldwide.On the basis of optical and absorption spectra of the fibers and the massive rose quartz, they concluded that the fibers are the cause of the pink coloration in this material.Heating and other experiments show that the pink color of the fibers is due to an Fe-Ti intervalence charge transfer that produces an optical absorption band at 500 nm.Based on X-ray diffraction and pleochroism characteristics, the best match for these inclusions is dumortierite, Al 7 (BO 3 )(SiO 4 ) 3 O 3 .However, infrared and Raman spectra do not exactly match standard dumortierite patterns, which suggests that the fibrous phase may be a material closely related to dumortierite.Rare euhedral pink quartz does not contain the fibers; rather, its color is explained by hole centers induced by radiation.
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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 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.006 | 0.005 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.252 | 0.066 |
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".