Ferrierit-Mg a Ba bohatý heulandit z Chvaletic u Přelouče (Česká republika)

Q3 Earth and Planetary Sciences

Bulletin Mineralogie Petrologie Pub Date : 2022-01-01 DOI:10.46861/bmp.30.197

P. Pauliš, Luboš Vrtiška, Z. Dolníček, Radana Malíková

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Abstract

Two zeolites are described from the pyrite-manganese deposit Chvaletice near Přelouč, central Bohemia, Czech Republic. Ferrierite-Mg forms brown, up to 5 mm long flat needles, radially arranged, which grow on grey-brown fine-grained rock composed of quartz, pyrite and Mn-silicates. The unit-cell parameters of ferrierite-Mg, refined from the powder X-ray diffraction data, are a = 19.162(14), b = 14.125(13), c = 7.495(6) Å and V = 2028.8(9) Å3 (space group Immm). Chemical analyses correspond to the empirical formula (Mg2.66Ca0.44Mn0.41Fe0.30Ba0.29K0.16Na0.10Sr0.03)Σ4.39(Al7.77 Si27.96O72)·18 H2O. The Ba-rich heulandite forms aggregates up to several cm in size composed of transparent gold-brown grains with characteristic pearly luster at cleavage planes. The unit-cell parameters of heulandite, refined from the powder X-ray diffraction data, are a = 17.732(2), b = 17.823(4), c = 7.4290(15) Å, β = 116.3(2) ° and V = 2104.2(6) Å3 (space group Cm). In BSE images, its aggregates are not homogenous. Ba-poor part of analyses corresponds to heulandite-Ca and heulandite-K, Ba-rich part beside Ca- and K-dominant members also to very rare heulandite-Ba. Both studied zeolites contain a significant content of Mn, ranging between 0.32 - 0.70 apfu (ferrierite-Mg) and 0.09 - 0.28 apfu (Ba-rich heulandite).

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来自Chvaletice u Přelouče（捷克共和国）的富含镁和钡的铁白云石

在捷克共和国波希米亚中部Přelouč附近的Chvaletice黄铁矿锰矿床中描述了两种沸石。铁素体-镁形成棕色，长达5毫米的扁平针状，呈放射状排列，生长在由石英、黄铁矿和锰硅酸盐组成的灰褐色细粒岩石上。根据粉末x射线衍射数据，得到铁素体- mg的单位胞参数为a = 19.162(14)， b = 14.125(13)， c = 7.495(6) Å， V = 2028.8(9) Å3(空间群Immm)。化学分析对应于实验式(Mg2.66Ca0.44Mn0.41Fe0.30Ba0.29K0.16Na0.10Sr0.03)Σ4.39(Al7.77 Si27.96O72)·18 H2O。富钡的榴辉石聚集体大小可达数厘米，由透明的金棕色颗粒组成，在解理面上具有典型的珍珠光泽。根据粉末x射线衍射数据，得到了heulandite的单位胞参数:a = 17.732(2)， b = 17.823(4)， c = 7.4290(15) Å， β = 116.3(2)°，V = 2104.2(6) Å3(空间群Cm)。在疯牛病图像中，其聚合体不是均匀的。贫ba的部分对应于钙镁镁和钾镁，富ba的部分也对应于非常罕见的钙钾镁镁。两种沸石的锰含量均较高，分别为0.32 ~ 0.70 apfu(铁素体- mg)和0.09 ~ 0.28 apfu(富钡的橄榄石)。

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来源期刊

Bulletin Mineralogie Petrologie Earth and Planetary Sciences-Economic Geology

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期刊介绍： Bulletin Mineralogie Petrologie is a peer-reviewed journal focused especially on: mineralogy, crystal chemistry and study of crystal structures of minerals study of mineral associations and processes of their origin meteoritics, research of tectites economic geology (of ore deposits) and study of history of mining of ore deposits topographic mineralogy petrology of igneous, metamorphic and sedimentary rocks instrumental analytical methods at mineralogy and petrology mineralogy and petrology as tools for archeology and similar disciplines