The effects of composition upon the high-pressure behaviour of amphiboles: compression of gedrite to 7 GPa and a comparison with anthophyllite and proto-amphibole
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Bibliographic record
Abstract
Abstract A single-crystal X-ray diffraction study of a sample of natural gedrite from North Carolina, USA, with the crystal-chemical formula A Na 0.47 B (Na 0.03 Mg 0.97 Fe 0.94 2+ Mn 0.02 Ca 0.04 ) C (Mg 3.52 Fe 0.28 2+ Al 1.15 Ti 0.05 4+ ) T (Si 6.31 Al 1.69 )O 22 W (OH) 2 , up to a maximum pressure of 7 GPa, revealed the following bulk and axial moduli and their pressure derivatives: K 0 T = 91.2(6) GPa [ K 0 T ' = 6.3(2)]; K 0 T ( a ) = 60.5(6) GPa [ K 0 T ( a )' = 6.1(2)]; K 0 T ( b ) = 122.8(2.6) GPa [ K 0 T ( b )' = 5.7(8)]; K 0 T ( c ) = 119.7(1.5) GPa [ K 0 T ( c )' = 5.1(5)]. Gedrite has a much higher bulk modulus than anthophyllite (66 GPa) and proto-amphibole (64 GPa). All of the three axial moduli of gedrite are higher than those of these two other orthoamphiboles. The greater stiffness of gedrite along [100] is due to its high A Na content, which is almost zero in anthophyllite and proto-amphibole. The much greater stiffness parallel to the (100) plane of gedrite compared with the two other amphiboles is probably due to its high C Al content. A comparison is made with published data available for orthorhombic B (Mg, Mn, Fe) and monoclinic B Ca amphiboles to identify correlations between crystal-chemistry and compressibility in amphiboles.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it