Рихтерит

Рихтерит
Формула Na(NaCa)Mg5Si8O22(OH)2
Статус IMA переопределён (Rd)[вд][1][2]
Кристаллографические свойства
Сингония моноклинная сингония[3]
Логотип Викисклада Медиафайлы на Викискладе

Рихтерит — минерал из группы щелочных амфиболов. Формула Na2Ca(Mg, Fe2+,Mn,Fe3+,Al)5[(OH,F)|Si4O11]2. Конечный член изоморфного ряда рихтерит-феррорихтерит. Спайность совершенная по (110), угол 55°33'. Цвет бурый, жёлтый, зелёный. Образует волокнистые кристаллы и асбестовидные скопления. Под действием паяльной трубки плавится с трудом. В кислотах не растворяется.

Кристаллы от длинно- до короткопризматических или игольчатые до волосовидных. Иногда в виде параллельно-шестоватых или параллельно-волокнистых, асбестовидных агрегатов и спутанно-волокнистых масс.

Предположительно, образует непрерывный изоморфный ряд с актинолитом.

Нахождение

В щелочных магматических породах, как минерал контактовых зон в скарнах и высокотемпературно-метаморфизованных известняках, среди гидротермальных продуктов в магматических породах основного состава, в метаморфизованных месторождениях железо-марганцевых руд, а также в мраморах.

Впервые найден на месторождении Лонгбан, Швеция (Långban, Filipstad, Värmland, Sweden).

Примечания

  1. ↑ International Mineralogical Association - Commission on new minerals, nomenclature and classification The IMA List of Minerals (February 2013) (англ.) — 2013.
  2. ↑ Hawthorne F. C., Oberti R., Harlow G. E., Maresch W. V., Martin R. F., Schumacher J. C., Welch M. D. Nomenclature of the amphibole supergroup (2012) (англ.) // American Mineralogist: An International Journal of Earth and Planetary Materials — Mineralogical Society of America, 1916. — Vol. 97. — P. 2031–2048. — ISSN 0003-004X; 1945-3027 — doi:10.2138/AM.2012.4276
  3. ↑ http://rruff.info/R060043/display=

Литература

  • Геологический словарь (3-е издание). В трёх томах. Том 3. Отв. ред. Петров О. В. Спб, 2012.

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