The paper presents detailed mineralogical and structural characteristics of novograblenovite that occurs abundantly on a burning coal dump at Radlin, Upper Silesia, Poland. Our results indicate that NH4MgCl3⋅6H2O is the proper formula of this mineral. The thermal behaviour of novograblenovite shows a two-step dehydration at 155 and 193°C and sublimation of NH4Cl at 341°C. A Raman spectrum, obtained for the first time, reveals the normal modes of H2O and NH4+ vibrations. The crystal structure of novograblenovite was refined on the basis of high quality X-ray diffraction data. The final discrepancy factor wR2 was 0.0567 for 94 parameters and 1464 independent reflections. The structure has a monoclinic C2/c space group symmetry with the following unit cell parameters: a = 9.2709(3) Å, b = 9.5361(2) Å, c = 13.2741(4) Å and β = 90.054(3)°. We were able to specify the architecture of the disordered NH4+ cation located at the symmetry centre. This led to reasonable parameters for the H-bonding formed by this cation. In carnallite the K+ cations occupy an identical space to the ammonium ion in novograblenovite, but when embedded into the latter crystal structure it is bound less tightly. Voids occupy 14% of the space in the novograblenovite crystal structure. Novograblenovite is exactly the same phase as the ‘redikortsevite’ described previously from Chelabinsk coal dumps and this informally introduced name should be abandoned.

本文介绍了在波兰上西里西亚Radlin的一个燃煤堆场中大量发生的新钙锰矿的详细矿物学和结构特征。我们的研究结果表明，NH 4的MgCl 3 ⋅6H 2 O为这种矿物质的适当公式。酚醛清漆的热行为表明在155和193°C发生两步脱水，在341°C发生NH 4 Cl升华。首次获得的拉曼光谱揭示了H 2 O和NH 4 +振动的正常模式。根据高质量的X射线衍射数据，对可挥发酚醛树脂的晶体结构进行了改进。最终差异因子w R 294个参数和1464个独立反射的结果为0.0567。该结构具有单斜C 2 / c空间群对称性，具有以下晶胞参数：a = 9.2709（3）Å，b = 9.5361（2）Å，c = 13.2741（4）Å和β= 90.054（3）° 。我们能够指定位于对称中心的无序NH 4 +阳离子的结构。这导致由该阳离子形成的H键的合理参数。在carnallite中，K +阳离子与夜蛾性诺富特中的铵离子占据相同的空间，但是当嵌入后者的晶体结构中时，其结合的紧密性就会降低。空隙占据了可夜影的诺贝特晶体结构中14％的空间。Novograblenovite与先前在Chelabinsk煤堆中描述的'redikortsevite'处于完全相同的阶段，因此应弃用这个非正式引入的名称。