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Frenswegen 3 deep bore, Frenswegen, Nordhorn, Lower Saxony, Germany

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(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:
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Anhydrite
    CaSO
     
    4
    Reference: [von Engelhardt, W., Füchtbauer, H., and Zemann, J. (1956): Contributions to Mineralogy and Petrology 5(3), 177-186.]
  		•  Calcite
    CaCO
     
    3
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Celestine
    SrSO
     
    4
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  'Chlorite Group'
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Dolomite
    CaMg(CO
     
    3
    		)
     
    2
    Reference: [von Engelhardt, W., Füchtbauer, H., and Zemann, J. (1956): Contributions to Mineralogy and Petrology 5(3), 177-186.]
  		•  'Feldspar Group'
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Glauberite
    Na
     
    2
    		Ca(SO
     
    4
    		)
     
    2
    Reference: [von Engelhardt, W., Füchtbauer, H., and Zemann, J. (1956): Contributions to Mineralogy and Petrology 5(3), 177-186.]
  		•  Halite
    NaCl
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Heidornite (TL)
    Na
     
    2
    		Ca
     
    3
    		B
     
    5
    		O
     
    8
    		(SO
     
    4
    		)
     
    2
    		Cl(OH)
     
    2
    Type Locality: Frenswegen 3 deep bore, Frenswegen, Nordhorn, Lower Saxony, Germany
    Reference: [von Engelhardt, W., Füchtbauer, H., and Zemann, J. (1956): Contributions to Mineralogy and Petrology 5(3), 177-186.]
  		•  Illite
    K
     
    0.65
    		A
     
    2.0
    		 [][Al
     
    0.65
    		Si,
     
    3.35
    		O
     
    10
    		](OH)
     
    2
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Montmorillonite
    (Na,Ca)
     
    0.33
    		(Al,Mg)
     
    2
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·nH
     
    2
    		O
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Polyhalite
    K
     
    2
    		Ca
     
    2
    		Mg(SO
     
    4
    		)
     
    4
    		·2H
     
    2
    		O
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Sulphur
    S
     
    8
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Tachyhydrite
    CaMg
     
    2
    		Cl
     
    6
    		·12H
     
    2
    		O
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]
  		•  Talc ?
    Mg
     
    3
    		Si
     
    4
    		O
     
    10
    		(OH)
     
    2
    Description: Authors report a "talc-like serpentine group mineral". The powder XRD corresponds to that of talc.
    Reference: [Füchtbauer, H., and Goldschmidt, H. (1956): Contributions to Mineralogy and Petrology 5(3), 187-203.]


    16 entries listed. 14 valid minerals. 1 type locality (valid mineral).

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