Karlseifertite, Pb (Ga<sub>2</sub>Ge)(AsO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>, a new dussertite-group mineral, from Tsumeb, Namibia

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Abstract 2 Ge)(AsO4) 2 (OH) 6, is a new member of the dussertite group, from Tsumeb, Namibia. It is a secondary oxidation-zone mineral found on fracture surfaces in germanite–chalcocite ore. Karlseifertite occurs in rosettes of thin, yellow, hexagonal plates up to about 0.2 mm in diameter and usually less than 0.01 mm thick. The mineral has a pale-yellow streak, subadamantine lustre, Mohs hardness of ∼ { 001 } and a calculated density of 4.993 g cm- 3 + ω = 1.890 (5) and ε = 1.894 (calc) (white light). The empirical formula from electron probe microanalyses is Pb0.99 2 + (Ga1.60 3 + Ge0.68 4 + Fe0.57 3 + Al0.12 3 +)Σ 2.97 0.76 5 + S0.15 6 + W0.09 6 +)Σ 1.00 4 ]2 (OH0.99) 6. Karlseifertite is trigonal with space group R 3 ‾ m and unit-cell parameters a = 7.2814 (7), c = 17.1077 (12) Å, V = 785.50 (15) Å3 and Z = 3. The mineral has an alunite-supergroup structure (R 1 = 0.0591 for 248 reflections with I > 2 σ I).

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch

Erschienen in
Karlseifertite, Pb (Ga2Ge)(AsO4)2(OH)6, a new dussertite-group mineral, from Tsumeb, Namibia ; volume:36 ; number:5 ; year:2024 ; pages:873-878 ; extent:6
European journal of mineralogy ; 36, Heft 5 (2024), 873-878 (gesamt 6)

Urheber
Kampf, Anthony R.
Désor, Joy
Ma, Chi

DOI
10.5194/ejm-36-873-2024
URN
urn:nbn:de:101:1-2501090909265.378451258762
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
15.08.2025, 07:31 MESZ

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Beteiligte

  • Kampf, Anthony R.
  • Désor, Joy
  • Ma, Chi

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