Prehnite
Query URLs
https://term.museum-digital.de/md-de/tag/55507
- Note
- Prehnite is an inosilicate of calcium and aluminium with the formula: Ca2Al(AlSi3O10)(OH)2. Limited Fe3+ substitutes for aluminium in the structure. Prehnite crystallizes in the orthorhombic crystal system, and most often forms as stalactitic or botryoidal aggregates, with only just the crests of small crystals showing any faces, which are almost always curved or composite. Very rarely will it form distinct, well-individualized crystals showing a square-like cross-section, including those found at the Jeffrey Mine in Asbestos, Quebec, Canada. Prehnite is brittle with an uneven fracture and a vitreous to pearly luster. Its hardness is 6-6.5, its specific gravity is 2.80-2.90 and its color varies from light green to yellow, but also colorless, blue, pink or white. In April 2000, rare orange prehnite was discovered in the Kalahari Manganese Fields, South Africa. Prehnite is mostly translucent, and rarely transparent.
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Prehnit
Fehér színű, üvegfényű,...
Object information
Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA -
Prehnit
Fehér, tompa üvegfényű erek.
Object information
Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA -
Prehnit, kvarc
Fehér tömött halmazok tömeges...
Object information
Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA -
Prehnit
Max. 3 mm-es fehér kristályok
Object information
Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA -
Prehnit
Fehér, táblás kristályok,...
Object information
Image: Herman Ottó Múzeum, Miskolc - CC BY-NC-SA
References
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