The astrophyllite supergroup: nomenclature and classification
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Bibliographic record
Abstract
Abstract Here we report a nomenclature and classification for the astrophyllite-supergroup minerals. The HOH block is the main structural unit in all astrophyllite-supergroup structures; it consists of three H–O–H sheets where the T 4 O 12 astrophyllite ribbons occur in the H sheets. In each structure, HOH blocks alternate with I (Intermediate) blocks along [001]. The twelve minerals of the astrophyllite supergroup are divided into three groups based on (1) the type of self-linkage of HOH blocks, i.e. (a) HOH blocks link directly where they share common vertices of D octahedra, or (b) HOH blocks do not link directly; and (2) the dominant cation of the O sheet (the C group: C 7 apfu). In the astrophyllite group (HOH blocks connect via D– X D P –D bridges, Fe 2+ is dominant at C 7 ), there are six minerals: astrophyllite, niobophyllite, zircophyllite, tarbagataite, nalivkinite and bulgakite. In the kupletskite group (HOH blocks connect via D–X D P –D bridges, Mn 2+ is dominant at C 7 ), there are three minerals: kupletskite, niobokupletskite and kupletskite-(Cs). In the devitoite group (HOH blocks do not connect via D–X D P –D bridges), there are three minerals: devitoite, sveinbergeite and lobanovite. The general formula for the astrophyllite-supergroup minerals is of the form A 2p BrC 7 D 2 (T 4 O 12 ) 2 IX D2 O X A4 O X D n P W A2 , where C [cations at the M (1–4) sites in the O sheet] = Fe 2+ , Mn, Na, Mg, Zn, Fe 3+ , Ca, Zr, Li; D (cations in the H sheets) = [6,5] Ti, Nb, Zr, Sn 4+ , [5] Fe 3+ , Mg, Al; T = Si, minor Al; A 2p B r IW A2 ( I block) where p = 1,2; r = 1,2; A = K, Cs, Ba, H 2 O, Li, Rb, Pb 2+ , Na,□; B = Na, Ca, Ba, H 2 O,□; I represents the composition of the central part of the I block, excluding peripheral layers of the form A 2p B r W A2 , e.g. (PO 4 ) 2 (CO 3 ) (devitoite); X D O = O; X A O = OH, F; X D P = F, O, OH, H 2 O,□, where n = 0, 1, 2 for (X D P ) n ; W A = H 2 O,□.
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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 | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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