Original paper
Schneiderhöhnit, ein natürliches Eisen-Arsen-Oxid aus der tiefen Oxidationszone von Tsumeb
[Schneiderhöhnite, a natural iron-arsenic-oxide from the deep oxidized zones at Tsumeb]
Ottemann, Joachim; Nuber, Bernhard; Geier, Bruno H.
Neues Jahrbuch für Mineralogie - Monatshefte Jg. 1973 Heft 11 (1974), p. 517 - 523
6 references
published: Feb 25, 1974
DOI: 10.1127/njmm/1973/1974/517
ArtNo. ESP156197311003, Price: 19.00 €
Abstract
Schneiderhöhnite was found in a druse with aggregates of crystals up to 7 mm in size from the deep oxidized zones at Tsumeb, S.W. Africa, associated with chalcocite and zincian stottite. The colour is deep brown, semiopaque, luster metallic to adamantine. The density is 4.3, the hardness approximately 3. The mineral is transparent in thin fragments, pleochroic with reddish-brown to light yellow colours; absorption X > Y < z. the refractive indices are nX > 2.11, nZ < 2.13. the reflectance is lower than that of chalcocite. microprobe analyses suggest the formula 8 feo • 5 as2O3. The mineral is triclinic with the lattice parameters: ao = 8.940 ± 0.004; b0 = 9.998 ± 0.004; c0 = 9.145 ± 0.005 Å; alpha = 63.00; beta = 116.20; gamma = 81.79 (all ± 0.03°); the space group is Ci1 or C11; the number of formula units in the cell is Z = 1. The six strongest lines are: d = 7.25 Å (st), d = 3.583 Å (st), d = 3.320 Å (m), d = 2.891 Å (st), d = 2.598 Å (st), d = 2.399 Å (st, d). The name is for the late Hans Schneiderhöhn, professor of mineralogy, university of Freiburg, Baden; it has been approved by IMA-Commission.
Keywords
Schneiderhöhnite • new description • paragenesis • chalcocite • zinc stottite • lattice constant • South-West Africa (Tsumeb)