Антигорит это листовой силикат, минерал каолинит-серпентиновой группы, полиморфен с клинохризотилом, лизардитом, ортохризотилом, парахризотилом. Агрегаты плотные, волокнистые. Поведение в кислотах: растворяется в HCl с образованием порошковатого кремнезема.
Обычный минерал регионально- и контактово-метаморфизованных серпентинитов; встречается в гидротермально-изменённых ультраосновных и карбонатных горных породах в ассоциях с хромитом, магнетитом, минералами группы оливина. Устойчив при высоких температурах до 600°C на глубинах до 60 км.
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