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Grootfonteinite, Pb...
Grootfonteinite, Pb3O(CO3)(2), a new mineral species from the Kombat Mine, Namibia, merotypically related to hydrocerussite
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- Siidra, Oleg, I (författare)
- St Petersburg State Univ, Dept Crystallog, Univ Emb 7-9, St Petersburg 199034, Russia;Russian Acad Sci, Kola Sci Ctr, Apatity 184209, Murmansk Region, Russia
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- Jonsson, Erik, 1967- (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik,Geol Survey Sweden, Dept Mineral Resources, Box 670, S-75128 Uppsala, Sweden
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- Chukanov, Nikita, V (författare)
- Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia
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- Nekrasova, Diana O. (författare)
- St Petersburg State Univ, Dept Crystallog, Univ Emb 7-9, St Petersburg 199034, Russia
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- Pekov, Igor, V (författare)
- Moscow MV Lomonosov State Univ, Fac Geol, Moscow 119991, Russia
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- Depmeier, Wulf (författare)
- Univ Kiel, Inst Geowissensch, Olshausenstr 40, D-24098 Kiel, Germany
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- Polekhovsky, Yury S. (författare)
- St Petersburg State Univ, Dept Mineral Deposits, Univ Emb 7-9, St Petersburg 199034, Russia
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- Yapaskurt, Vasilty O. (författare)
- Moscow MV Lomonosov State Univ, Fac Geol, Moscow 119991, Russia
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(creator_code:org_t)
- E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG, 2018
- 2018
- Engelska.
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Ingår i: European journal of mineralogy. - : E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG. - 0935-1221 .- 1617-4011. ; 30:2, s. 383-391
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Grootfonteinite, Pb3O(CO3)(2), is a new Pb oxycarbonate found in a mineralogically complex, banded assemblage from the Mn (-Fe) oxide ore unit of the Kombat mine. Grootfonteinite is named after the locality in the Grootfontein district. The mineral forms platy grains up to 1 mm across and up to 0.2 mm thick included in and intergrown with massive cerussite. Grootfonteinite is colourless, with white streak and adamantine lustre. It is brittle with perfect cleavage on (0 0 1). The density calculated using the empirical formula H0.345Na0.275Ca0.045Pb2.645C2O7 is 6.856 g.cm(-3). The strongest five reflections in the X-ray powder-diffraction pattern [(d in angstrom)-(Intensity)-(hkl)] are: 4.586-25-0 1 0, 3.244-100-0 1 3, 2.652-30-1 1 0, 2.294-21-0 2 0, 2.053-39-0 2 3. Grootfonteinite crystallizes in space group P6(3)/mmc (No. 194), a = 5.303(1), c = 13.770(3) angstrom, v= 335.3(1) angstrom(3), Z= 2. The crystal structure of grootfonteinite is formed by layered blocks which consist of sheets with composition [PbCO3] and (ideally) [PbO], the stacking of which can be described as center dot center dot center dot-[PbCO3]-[PbO]-[PbCO3]-center dot center dot center dot The composition of the resulting electroneutral 2D block is {[Pb-2(CO3)(2)][(Pb0.7Na0.3)(O-0.7(OH)(0.3))]}(0). The stereochemically active 6S(2) lone electron pairs of the two Pb atoms are located in between the blocks, resembling the classical case of the structure of litharge. Grootfonteinite is structurally related to hydrocerussite, abellaite, and plumbonacrite. A characteristic structural feature of all these minerals is the presence of [PbCO3](0) sheets in the upper and lower parts of invariably electroneutral 2D blocks, the middle part being variable. The topology of 2D blocks in the crystal structure of grootfonteinite can be considered as intermediate between those of abellaite and hydrocerussite. These three minerals can be considered to form a merotype family. Other members of this family can be hypothesized which differ in the nature of the interleaved sheets.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Nyckelord
- grootfonteinite
- carbonate
- lead
- hydrocerussite
- abellaite
- layered structure
- new mineral
- Kombat mine
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Siidra, Oleg, I
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Jonsson, Erik, 1 ...
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Chukanov, Nikita ...
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Nekrasova, Diana ...
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Pekov, Igor, V
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Depmeier, Wulf
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Polekhovsky, Yur ...
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Yapaskurt, Vasil ...
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