Yarzhemskiite, K[B<sub>5</sub>O<sub>7</sub>(OH)<sub>2</sub>]⋅H<sub>2</sub>O, a new mineral from the Chelkar salt dome, Western Kazakhstan
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Bibliographic record
Abstract
Abstract The new mineral yarzhemskiite, K[B 5 O 7 (OH) 2 ]⋅H 2 O, was found in a halite–sylvite evaporite rock at the Chelkar salt dome, Western Kazakhstan Region, Kazakhstan. It is also associated with carnallite, polyhalite, gypsum, strontioginorite, satimolite and quartz. Yarzhemskiite occurs as separate thick tabular, short prismatic or equant crystals up to 0.5 mm × 0.7 mm × 1 mm and grains having irregular outlines up to 1 mm × 1.5 mm × 2 mm. The mineral is transparent, colourless, with vitreous lustre. It is brittle, the Mohs’ hardness is ca 2½. Cleavage is perfect on {100}. D meas is 2.13(1) and D calc is 2.112 g cm –3 . Yarzhemskiite is optically biaxial (+), α = 1.484(2), β = 1.508(2), γ = 1.546(2), 2V meas = 75(10)° and 2V calc = 80°. Chemical composition (wt.%, electron microprobe, H 2 O was calculated by stoichiometry) is: Na 2 O 0.01, K 2 O 17.84, CaO 0.07, B 2 O 3 67.21, H 2 O calc 13.91, total 99.04. The empirical formula based on 10 O atoms per formula unit is K 0.98 B 5.005 O 7 (OH) 2 ⋅H 2 O. Yarzhemskiite is monoclinic, P 2 1 / c , a = 9.47340(18), b = 7.52030(16), c = 11.4205(2) Å, β = 97.3002(17)°, V = 807.03(3) Å 3 and Z = 4. The strongest reflections of the powder XRD pattern [ d ,Å( I ,%)( hkl )] are: 9.39(86)(100), 4.696(41)(200), 3.296(18)( $\bar{1}$ 13), 3.130(19)(022, 300), 2.935(42)(220), 2.898(100)( $\bar{3}$ 02, $\bar{2}$ 21, 310), 2.832(56)(004) and 1.867(18)( $\bar{2}$ 25). The crystal structure was solved based on single-crystal X-ray diffraction data, R 1 = 3.36%. The structure contains infinite chains built by boron-centred polyhedra. The basic structural unit of the chain is a double ring B 5 O 7 (OH) 2 consisting of one BO 4 tetrahedron and four BO 3 triangles. K + cations centre ten-fold polyhedra which form, together with the borate chains [B 5 O 7 (OH) 2 ] – ∝ , layers linked with each other only via H bonds. The mineral is named in honour of the Russian geologist, petrologist and mineralogist Yakov Yakovlevich Yarzhemskii (1901–?), a specialist in petrology of evaporite rocks and mineralogy and genesis of boron deposits related to evaporites.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.001 | 0.005 |
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