Karlseifertite, Pb (Ga2Ge)(AsO4)2(OH)6, 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).

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Bibliographic citation: 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)

Creator: Kampf, Anthony R.
Désor, Joy
Ma, Chi

DOI: 10.5194/ejm-36-873-2024

URN: urn:nbn:de:101:1-2501090909265.378451258762

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:31 AM CEST

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Kampf, Anthony R.
Désor, Joy
Ma, Chi

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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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Other Objects (12)

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