Three ammonium-iron-sulfites (AIS) from a burning coal dump in an abandoned open coal pit at Pécs-Vasas (Mecsek Mountains, South Hungary) were identified: (NH₄)₉Fe³⁺(SO₃)₆ (AIS-1), (NH₄)₂Fe²⁺(SO₃)₂ (AIS-2), and (NH₄)₂Fe³⁺(OH)(SO₃)₂·H₂O (AIS-3). They were formed by the interaction of decomposing iron sulfides and ammonia released from organic matter. AIS-1 and AIS-2 are metastable; they break down in a few weeks (AIS-1) respectively years (AIS-2). AIS-1 forms red, stubby columnar to thick tabular crystals up to 0.2 mm in length. AIS-2 appears as brown tabular to short prismatic crystals up to 0.1 mm, often they create columnar intergrowths. AIS-3 is more stable. It was approved as a new mineral species (mineral name kollerite, IMA-CNMNC 2018–131). Sprays of natural kollerite up to 1.5 mm are composed of yellow, long-prismatic or lath-like crystals up to 0.1 mm in length. AIS-1 is characterized by powder-X-ray diffraction only. The crystal structures of AIS-2 [synthetic material, R\(\overline {3}\)m, a = 5.3879(8), c = 19.980(4) Å] and kollerite [Cmcm, a = 17.803(15), b = 7.395(5), c = 7.096(5) Å] were investigated by single-crystal X-ray diffraction. AIS-2 is topologically equivalent to bütschliite. Isolated Fe²⁺O₆ polyhedra are corner-connected to sulfite anions. 2D nets with composition [Fe²⁺(SO₃)₂]²⁻ are parallel to (0001). Kollerite crystallizes in a new structure type. The FeO₆ octahedra are corner linked to buckled [Fe³⁺(OH)(SO₃)₂]²⁻ chains. In both cases, ammonium cations are intercalated. Connection is verified by hydrogen bonds only; all H atom positions are located experimentally.

在 Pécs-Vasas（Mecsek 山脉，匈牙利南部）一个废弃露天煤坑的燃烧煤堆中鉴定出三种亚硫酸铵铁 (AIS)：(NH 4 ) ₉ Fe ₃₊ ( ^SO 3 ₎ 6 ₍ AIS- 1), (NH ₄ ) ₂ Fe ²⁺ (SO ₃ ) ₂ (AIS-2), (NH ₄ ) ₂ Fe ³⁺ (OH)(SO ₃ ) ₂ ·H ₂O（AIS-3）。它们是由分解的硫化铁和从有机物中释放的氨相互作用形成的。AIS-1 和 AIS-2 是亚稳态的；它们分别在数周 (AIS-1) 和数年 (AIS-2) 内发生故障。AIS-1 形成红色、粗短的柱状到厚板状晶体，长度可达 0.2 毫米。AIS-2 表现为棕色板状到最大 0.1 毫米的短棱柱形晶体，通常它们会产生柱状共生。AIS-3 更稳定。它被批准为新矿物物种（矿物名称kollerite，IMA-CNMNC 2018-131）。最大 1.5 毫米的天然钾镁石喷雾由最长 0.1 毫米的黄色、长棱柱形或板条状晶体组成。AIS-1 仅通过粉末 X 射线衍射表征。AIS-2 [合成材料, R \(\overline {3}\) m , a = 5.3879(8), c  = 19.980(4) Å] 和钾岭石 [ Cmcm , a  = 17.803(15), b  = 7.395(5), c  = 7.096(5) Å] 通过单晶 X 射线研究衍射。AIS-2 在拓扑上等同于 bütschliite。孤立的Fe ²⁺ O ₆多面体角连接到亚硫酸根阴离子。组成为[Fe ²⁺ (SO ₃ ) ₂ ] ²⁻的二维网络平行于(0001)。Kollerite 以一种新的结构类型结晶。FeO ₆八面体角连接到弯曲[Fe ³⁺ (OH)(SO ₃ ) ₂ ]²⁻链。在这两种情况下，铵阳离子都被嵌入。仅通过氢键验证连接；所有 H 原子位置都是通过实验定位的。