Unter hydrothermalen Bedingungen bei 1000‐1500 atm werden bei Temperaturen oberhalb 570°C aus wäßrigen KF‐ oder Na2CO3‐Lösungen Kristalle der rhombischen Sb2O3‐Modifikation (Valentinit) und unterhalb 570°Kristalle der kubischen Sb2O3‐Modifikation (Senarmontit) erhalten.
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