Английская Википедия:Ankerite
Шаблон:Short description Шаблон:Infobox mineral
Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates with the chemical formula Шаблон:Chem2. In composition it is closely related to dolomite, but differs from this in having magnesium replaced by varying amounts of iron(II) and manganese. It forms a series with dolomite and kutnohorite.[1]
The crystallographic and physical characters resemble those of dolomite and siderite. The angle between the perfect rhombohedral cleavages is 73° 48′, the hardness is 3.5 to 4, and the specific gravity is 2.9 to 3.1. The color is white, grey or reddish to yellowish brown.[2]
Ankerite occurs with siderite in metamorphosed ironstones and sedimentary banded iron formations. It also occurs in carbonatites. In sediments it occurs as authigenic, diagenetic minerals and as a product of hydrothermal deposition.[3] It is one of the minerals of the dolomite-siderite series, to which the terms brown-spar, pearl-spar and bitter-spar have been historically loosely applied.[2]
It was first recognized as a distinct species by Wilhelm von Haidinger in 1825, and named for Matthias Joseph Anker (1771–1843) of Styria, an Austrian mineralogist.[1]
It has been found in Western Tasmania, in mines in Dundas, Tasmania.
Image gallery
-
Ankerite on pyrite from King County, Washington
-
Ankerite on quartz from Peru
See also
References
Шаблон:Refbegin Шаблон:Reflist
External links
- Страницы с неработающими файловыми ссылками
- Английская Википедия
- Calcium minerals
- Magnesium minerals
- Iron(II) minerals
- Manganese(II) minerals
- Carbonate minerals
- Dolomite group
- Trigonal minerals
- Minerals in space group 148
- Luminescent minerals
- Страницы, где используется шаблон "Навигационная таблица/Телепорт"
- Страницы с телепортом
- Википедия
- Статья из Википедии
- Статья из Английской Википедии
- Страницы с ошибками в примечаниях
