Bismoclite BiOCl from the Jean Baptiste mine, Lavrion area, Greece

Autor(en)

Irene Liebhart, Branko Rieck, Manuela Zeug, Gerald Giester

Abstrakt

Bismoclite

was first discovered and described from a museum specimen No 4465 in

the McGregor Museum, Kimberly. The sample is from Jakkalswater, South

Africa (Mountain, 1935). Chemical analysis resulted in Bi₂O₃ 89.41, Cl 13.67, less O=Cl₂

3.08, sum 100 wt. % (Mountain, 1935). In the same year, Bannister &

Hey (1935) synthesised the compound BiOCl and named it bismoclite. The

crystal structure was solved on synthetic samples in space group P4/nmm, with unit cell data a = 3.887(5), c

= 7.354(5) Å and refined to R = 9.17% (Keramidas et al. 1993).

Furthermore, a sample from a Bi-Cu-Au deposit, Argentina was studied by

infrared analysis, thermal analysis using DTA and TGA, chemical analysis

using inductively coupled plasma mass spectrometry (ICP-MS) and an

instrumental neutron activation analysis (INAA), microscopy analysis

using scanning electron microscopy (SEM), and by pXRD (Testa et al.

2016).
Recently, rare bismoclite was discovered at the 2^nd

level of the Jean Baptiste Mine in the central part of the Agios

Konstantinos area, Lavrion mining district, Attica, Greece. Natural

bismoclite was investigated for the first time by single-crystal X-ray

diffraction, confirming space group P4/nmm with unit cell parameters a = 3.887 (2), c

= 7.357 (5) Å, Z = 2, V = 111.16 (14) Å3 and refined to final values R1

= 0.0134 and wR2 = 0.0363. Examined by Raman spectroscopy, the spectrum

shows the most intense Raman band at 144 cm^-1, smaller bands were observed at 198 and 396 cm^-1.

Organisation(en)

Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Landesamt für Geologie und Bergwesen Sachsen-Anhalt

Publikationsdatum

2023

ÖFOS 2012

105116 Mineralogie, 105113 Kristallographie

Link zum Portal