Contribution
Rooseveltite from Moldava, Krušné hory Mts., Czech Republic
Sejkora, J.; Řídkošil, T.; Šrein. V.,
Neues Jahrbuch für Mineralogie - Monatshefte Jg. 1994 Heft 1 (1994), p. 40 - 48
34 références bibliographiques
publié: Feb 7, 1994
DOI: 10.1127/njmm/1994/1994/40
ArtNo. ESP156199401003, Prix: 19.00 €
Abstract
The rare mineral rooseveltite, ⍺-Bi (AsO4), has been identified as secondary mineral in fluorite-quartz-barite vein Josef at Moldava, Krusné hory Mts., Czech Republic. Rooseveltite occurs as fine grained, white, white-green and white-grey powder coatings. The mineral is biaxial positive with refractive indices of n£ = 2.09 (4), nw = 2.27(2). Monoclinic unit cell parameters for space group P 21/n are a = 6.877(4)Å, b = 7.162 (5)Å, c = 6.750 (5)Å, ß = 104.73 (5)°, V = 321.5 (5)Å3. Chemical composition corresponds closely to the ideal formula. The IR absorption spectra are given. Rooseveltite from Moldava is interpreted to be a product of oxidation of native bismuth, and tennantite.
Mots-clefs
Rooseveltite • monazite type structures • secondary minerals