Saranovskite, SrCaFe2+2(Cr4Ti2)Ti12O38, a new crichtonite-group mineral

Haitaite‐(La), (La, Ce)(U4+, U6+, Fe2+)(Fe3+, Al)2(Ti, Fe2+, Fe3+)18O38, is a new member of the crichtonite group. It is named after the Haita Village in the Miyi County of Sichuan Province, China, where the mineral was discovered. The mineral occurs as black opaque centimeter‐sized aggregates in the external contact zone between the Neoproterozoic (∼800 Ma) alkali feldspar granite and the Mesoproterozoic (∼1700 Ma) micaschist. In the studied sample, haitaite‐(La) is associated with other minerals, including ilmenite, magnetite, rutile, zircon, brannerite and uraninite. The new mineral is a black, metallic phase and has a Mohs hardness of 6, with a density of 4.99 g/cm3 (calculated) and 5.03 g/cm3 (measured). Haitaite‐(La) is opaque in transmitted light and grayish‐white under reflected light, with a reflectivity between 22.5% and 16.42% in the 400–700 nm band (SiC, in the air). The compositions of the mineral were measured by EPMA, the U4+/U6+ ratio was determined by X‐ray photoelectron spectroscopy and the Fe2+/Fe3+ ratio was determined by Mössbauer spectroscopy. Haitaite‐(La) is trigonal, belongs to and has unit‐cell parameters a = 10.3678(5) Å, c = 20.8390(11) Å, V = 1939.9(2) Å3, Z = 3. The crystalline structure is composed of octahedra with 9 layers of close‐packed octahedra (M1, M3, M4, M5), tetrahedra (M2) and contains large 12‐coordinated M0 sites.

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Haitaite‐(La), LaU⁴⁺Fe³⁺₂(Ti₁₃Fe²⁺4Fe³⁺)_Σ18O₃₈, a New Member of the Crichtonite Group

WANG

Fan

et al. 2022

Acta Geologica Sinica (Eng)

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Botuobinskite and mirnyite, two new minerals of the crichtonite group included in Cr-pyrope xenocrysts from the Internatsionalnaya kimberlite

Rezvukhin

Rashchenko

Sharygin

et al. 2023

MinMag

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Two new mineral species of the crichtonite group -botuobinskite, ideally SrFe 2+ (Ti 4+ 12Cr 3+ 6)Mg2[O36(OH)2], and mirnyite, ideally SrZr(Ti 4+ 12Cr 3+ 6)Mg2O38, occur as inclusions in mantle-derived Cr-pyrope xenocrysts from the Internatsionalnaya kimberlite pipe, Mirny field, Siberian craton. Botuobinskite forms needle-and blade-like acicular crystals up to 1 mm in length and up to 30 µm in diameter, a large platy inclusion (700x700x80 µm) and roughly isometric grains (up to 80 µm), while mirnyite occurs as needle-and blade-like elongated inclusions (up to 1 mm). Both minerals are jet-black, opaque and exhibit metallic lustre. In plane-polarised incident reflected light, botuobinskite and mirnyite are greyish-white with a weak brownish tint. Between crossed polars, the new species show distinct anisotropy in shades of bluish grey to greenish-brown. Neither bireflectance nor pleochroism is observed. Calculated densities for botuobinskite and mirnyite are 4.3582(5) and 4.3867(3) gm/cm 3 , respectively. The crystal structures of botuobinskite and mirnyite have been refined (R = 0.0316 and 0.0285, respectively) from single crystal X-ray diffraction data. The minerals are trigonal, crystallize in the space group R−3 (No. 148) and are isostructural with other members of the crichtonite group.

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Saranovskite, SrCaFe2+2(Cr4Ti2)Ti12O38, a new crichtonite-group mineral

Cited by 2 publications

References 21 publications

Haitaite‐(La), LaU⁴⁺Fe³⁺₂(Ti₁₃Fe²⁺4Fe³⁺)_Σ18O₃₈, a New Member of the Crichtonite Group

Haitaite‐(La), LaU⁴⁺Fe³⁺₂(Ti₁₃Fe²⁺4Fe³⁺)_Σ18O₃₈, a New Member of the Crichtonite Group

Botuobinskite and mirnyite, two new minerals of the crichtonite group included in Cr-pyrope xenocrysts from the Internatsionalnaya kimberlite

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Saranovskite, SrCaFe2+2(Cr4Ti2)Ti12O38, a new crichtonite-group mineral

Cited by 2 publications

References 21 publications

Haitaite‐(La), LaU4+Fe3+2(Ti13Fe2+4Fe3+)Σ18O38, a New Member of the Crichtonite Group

Haitaite‐(La), LaU4+Fe3+2(Ti13Fe2+4Fe3+)Σ18O38, a New Member of the Crichtonite Group

Botuobinskite and mirnyite, two new minerals of the crichtonite group included in Cr-pyrope xenocrysts from the Internatsionalnaya kimberlite

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Haitaite‐(La), LaU⁴⁺Fe³⁺₂(Ti₁₃Fe²⁺4Fe³⁺)_Σ18O₃₈, a New Member of the Crichtonite Group

Haitaite‐(La), LaU⁴⁺Fe³⁺₂(Ti₁₃Fe²⁺4Fe³⁺)_Σ18O₃₈, a New Member of the Crichtonite Group