Biogenic orthorhombic α-calcium formate from sediments of Alkali Lake, Oregon, USA

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Marco E. Ciriotti
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Biogenic orthorhombic α-calcium formate from sediments of Alkali Lake, Oregon, USA

Messaggio da Marco E. Ciriotti » sab 24 apr, 2021 15:29

Referenza:
▪ Chukanov, N.V., Menor-Salvan, C., Izatulina, A.R., Gurshiy, V.V., Pekov, I.V., Vigasina, M.f., Ksenofontov, D.A., Britvin, S.N. (2021): Biogenic Orthorhombic α-Calcium Formate from Sediments of Alkali Lake, Oregon, USA. Minerals, 11, 448.

Abstract:
Centimeter-sized crystals of orthorhombic calcium formate, α-Ca(HCO2)2 from Alkali Lake, Oregon, USA have been studied by means of powder and single-crystal X-ray diffraction analysis, infrared, and Raman spectroscopy. Based on the data on carbon isotope abundance in calcium formate and associated minerals, it was concluded that the formation of α-Ca(HCO2)2 may be a result of a combination of two factors: lake microbial metabolism and anthropogenic pollution with Agent Orange. Possible causes of stability of the low-density tetragonal β-Ca(HCO2)2 polymorph (formicaite) in boron ores are discussed.
Marco E. Ciriotti

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