The new beudantite-group mineral oberwolfachite, ideally SrFe3+3(AsO4)(SO4)(OH)6, was discovered in two localities: Clara mine, Oberwolfach, Schwarzwald, Baden-Württemberg, Germany (holotype) and Monterniers mine, Lantignié, Rhône, Auvergne-Rhône-Alpes, France (cotype). The associated minerals are quartz, baryte, hematite, illite, goethite, beudantite and dussertite (Clara) and arsenogoyazite, jarosite, graulichite-(Ce), goethite and hematite (Monterniers). Oberwolfachite forms yellow to brown platy crystals up to 1 mm across or thick outer zones of mixed (oberwolfachite–beudantite) crystals up to 3 mm across. The lustre is adamantine and the streak is yellow. A distinct cleavage on {0001} is observed. Calculated density is 3.874 g⋅cm–3. The infrared spectra are given. The chemical composition of the holotype/cotype samples are (wt.%, b.d.l. = below detection limit): K2O 1.25/1.86, SrO 6.41/11.15, BaO 8.13/0.45, PbO 2.18/b.d.l., Al2O3 0.16/0.23, Fe2O3 38.99/39.98, La2O3 1.68/not determined, Ce2O3 1.28/2.06, P2O5 0.12/b.d.l., As2O5 17.55/16.55, SO3 12.86/14.99, H2O (calculated) 8.72/9.05, total 99.33/96.62. The empirical formula of the holotype sample is (Sr0.38Ba0.33K0.16Pb0.06La0.06Ce0.05)Σ1.04(Fe3+3.03Al0.02)Σ3.05[(SO4)1.00(AsO4)0.95(PO4)0.01](O6.16H6.00). The crystal structures of both samples were determined using single-crystal X-ray diffraction data and refined to R = 3.13% (holotype, 293 K) and 2.65% (cotype, 170 K). Oberwolfachite is trigonal, R${\bar 3}$m, with a = 7.3270(3) Å, c = 17.0931(9) Å and V = 794.70(8) Å3 (holotype), and a = 7.298(2) Å, c = 16.908(3) Å and V = 779.8(4) Å3 (cotype); Z = 3. The strongest lines of the powder X-ray diffraction pattern of holotype [d, Å (I, %)(hkl)] are: 5.95 (56)(101), 3.664 (37)(110), 3.117 (16)(021), 3.082 (100)(113), 2.548 (15)(024), 2.280 (22)(107), 1.983 (26)(303) and 1.832 (19)(220).

新的锂辉石族矿物 oberwolfachite，最好是 SrFe 3+ 3 (AsO 4 )(SO 4 )(OH) 6, 发现于两个地点：Clara 矿，Oberwolfach，Schwarzwald，Baden-Württemberg，德国（正模）和 Monterniers 矿，Lantignié，Rhône，Auvergne-Rhône-Alpes，法国（cotype）。伴生矿物有石英、重晶石、赤铁矿、伊利石、针铁矿、闪锌矿和杜塞石 (Clara) 以及毒砂岩、黄钾铁矾、graulichite-(Ce)、针铁矿和赤铁矿 (Monterniers)。Oberwolfachite 形成黄色至棕色片状晶体，直径达 1 毫米，或混合（oberwolfachite-beudantite）晶体的厚外部区域达 3 mm。光泽为金刚砂，条痕为黄色。观察到 {0001} 上的明显裂解。计算出的密度为 3.874 g⋅cm –3。给出了红外光谱。正模/共模样品的化学成分为（wt.%，bdl = 低于检测限）：K 2ø1.25 / 1.86，SRO 6.41 / 11.15，BaO的8.13 / 0.45，PBO 2.18 / BDL，AL 2 ö 3 0.16 / 0.23，铁2 ö 3 38.99 / 39.98，拉2 ö 3 1.68 /未测定，CE 2 ö 3 1.28 /2.06、P 2 O 5 0.12/bdl、As 2 O 5 17.55/16.55、SO 3 12.86/14.99、H 2 O（计算）8.72/9.05，合计99.33/96.62。正模样品的经验公式为 (Sr 0.38 Ba 0.33 K 0.16 Pb 0.06 La 0.06 Ce 0.05 )Σ1.04 (Fe 3+ 3.03 Al 0.02 ) Σ3.05 [(SO 4 ) 1.00 (AsO 4 ) 0.95 (PO 4 ) 0.01 ](O 6.16 H 6.00 )。两个样品的晶体结构均使用单晶 X 射线衍射数据确定，并精制为R = 3.13%（正模，293 K）和 2.65%（共型，170 K）。Oberwolfachite 是三角形的，R ${\bar 3}$ m，a = 7.3270(3) Å，c = 17.0931(9) Å 和V = 794.70(8) Å 3（正模），a = 7.298(2) Å，c = 16.908(3) Å 和V = 779.8(4) Å 3（共型）；Z = 3。 正模[ d, Å ( I , %)( hkl )]的粉末X射线衍射图最强谱线为：5.95 (56)(101), 3.664 (37)(110), 3.117 ( 16)(021)、3.082 (100)(113)、2.548 (15)(024)、2.280 (22)(107)、1.983 (26)(303) 和 1.832 (19)(220)。