Frenswegen 3 deep bore, Frenswegen, Nordhorn, Lower Saxony, Germany
(Tiefbohrung Frenswegen 3, Frenswegen, Nordhorn, Niedersachsen, Deutschland)
A borehole driven for natural gas prospection. Below the methane-bearing dolomite, at a depth of 1924.8 m, the bore hit the Zechstein formation, composed of thin layers of conglomerate and limestone over a thick (238 m) layer of anhydrite. Heidornite was discovered in a cleft in the upper part of the anhydrite layer, at a depth of 1968 m.
Located NW of Nordhorn.
References:
- von Engelhardt, W., Füchtbauer, H., and Zemann, J. (1956): Heidornit Na2Ca3[Cl · (SO4)2 · B5O8(OH)2] ein neues Bormineral aus dem Zechsteinanhydrit - Mit einer röntgenographischen Untersuchung. Contributions to Mineralogy and Petrology 5(3), 177-186 (in German).
- Füchtbauer, H., and Goldschmidt, H. (1956): Ein Zechsteinanhydrit-Profil mit Einlagerungen von Montmorillonit und einer abweichenden Serpentinvarietät. Contributions to Mineralogy and Petrology 5(3), 187-203 (in German).
Mineral List:16 entries listed. 14 valid minerals. 1 type locality (valid mineral).
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