SODIC-FERRI-FERROPEDRIZITE AND FERRI-CLINOFERROHOLMQUISTITE: MINERAL DATA AND DEGREE OF ORDER OF THE A-SITE CATIONS IN Li-RICH AMPHIBOLES
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Bibliographic record
Abstract
A systematic examination of metamorphic episyenites in the Pedriza Massif, Sierra de Guadarrama, Spain, allowed detection of two more distinct Li-rich C 2/ m amphibole species. They can be related to previously described species via the homovalent exchanges M 1(Fe2+Mg−1) and M 2(Fe3+Al−1), and represent the compositions richest in Fe in this compositional space. The ideal formula of ferri-clinoferroholmquistite is A □ B Li2 C (Fe3+ 2Fe2+ 3) T Si8 O22 X (OH)2, and that of sodic-ferri-ferropedrizite is A Na B Li2 C (Fe3+ 2Fe2+ 2Li) T Si8 O22 X (OH)2, with Z = 2. Holotype ferri-clinoferroholmquistite (IMA–CNMMN 2001–066), A (Na0.28K0.00)∑0.28 B (Li1.90Na0.08Ca0.02)∑2.00 C (Fe3+ 1.68Fe2+ 1.55Mg1.06Li0.28Al0.26Ti0.01Mn2+ 0.14Zn0.02)∑5.00 T Si8.00 O22O3(OH1.79F0.24)∑2.03, has a 9.462(6), b 17.898(9), c 5.302(3) A, β 101.88(4)°, V 878.6(2) A3. Holotype sodic-ferri-ferropedrizite (IMA–CNMMN 2001– 068), A (Na0.53K0.03)∑0.56 B (Li1.82Na0.15Ca0.03)∑2.00 C (Fe3+ 1.55Fe2+ 1.49Mg0.95Li0.58Al0.21Ti0.13 Mn2+ 0.07Zn0.01)∑4.99 T Si8.00 O22 X (OH1.45F0.52)∑1.97, has a 9.496(4), b 17.883(8), c 5.297(2) A, β 102.06(3)°, V 879.6(2) A3. Sodic-ferri-ferropedrizite and ferri-clinoferroholmquistite are both black, with a vitreous luster. They have a gray streak and do not show fluorescence under long-and short-wave ultraviolet light; they are brittle with an uneven fracture, and have the characteristic {110} cleavage of monoclinic amphiboles. The calculated values of density are 3.23 and 3.24 g/cm3, and the calculated mean indices of refraction are 1.708 and 1.710, respectively. The shape of the electron density at the A sites changes as a function of the B Li and C Li contents, suggesting that cation ordering is strongly affected by local bond-valence requirements. This feature is confirmed by systematic bond-valence – bond-strength calculations, which support the sequence ( M 4′Li–O3F– Am Na) > ( M 4′Li–O3OH– Am Na) of preferred local configurations.
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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 | 0.001 |
| 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