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4 - 5
Crystal System:
Named in honour of Dr. F. Heidorn, Bentheim, Germany, for his scientific study of the Zechstein deposits.
This page provides mineralogical data about Heidornite.

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Classification of HeidorniteHide

Approved, 'Grandfathered' (first described prior to 1959)

E : Pentaborates
C : Phyllo-pentaborates

3 : Anhydrous Compound Sulfates containing Hydroxyl or Halogen

10 : Borates with other anions
3 : Borates with sulphate

Physical Properties of HeidorniteHide

4 - 5 on Mohs scale

Optical Data of HeidorniteHide

Biaxial (+)
RI values:
nα = 1.579 nβ = 1.588 nγ = 1.604
Measured: 63° to 77°, Calculated: 76°
Max Birefringence:
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
very weak

Chemical Properties of HeidorniteHide

IMA Formula:

Crystallography of HeidorniteHide

Crystal System:
Cell Parameters:
a = 10.19 Å, b = 7.76 Å, c = 18.81 Å
β = 93.33°
a:b:c = 1.313 : 1 : 2.424
Unit Cell V:
1,484.88 ų (Calculated from Unit Cell)

Type Occurrence of HeidorniteHide

Other Language Names for HeidorniteHide

Related Minerals - Nickel-Strunz GroupingHide

6.EC.05BiringucciteNa2B5O8(OH) · H2OMon.
6.EC.05NasiniteNa2[B5O8(OH)] · 2H2OOrth.
6.EC.10GoweriteCa[B5O8(OH)][B(OH)3] · 3H2OMon.
6.EC.15P-VeatchiteSr2B11O16(OH)5 · H2O
6.EC.15VeatchiteSr2B11O16(OH)5 · H2OMon. m : Bb
6.EC.20VolkovskiteKCa4[B5O8OH]4[B(OH)3]2Cl · 4H2OTric. 1 : P1
6.EC.25TuzlaiteNaCaB5O8(OH)2 · 3H2OMon. 2/m : P21/b
6.EC.35BrianroulstoniteCa3[B5O6(OH)6](OH)Cl2 · 8H2OMon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.3.1SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
10.3.3CharlesiteCa6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2OTrig. 3m : P3 1c

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HeidorniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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).
American Mineralogist (1957): 42: 120.
Burzlaff, H. (1967): Die Struktur des Heidornit, Ca3Na2Cl(SO4)2B5O8(OH)2. Neues Jahrbuch für Mineralogie, Monatshefte 1967, 157-169 (in German).
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for HeidorniteHide

Localities for HeidorniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany (TL)
  • Lower Saxony
    • Nordhorn
      • Frenswegen
von Engelhardt, W., Füchtbauer, H., and Zemann, J. (1956): Contributions to Mineralogy and Petrology 5(3), 177-186.
  • Thuringia
    • Harz
      • Nordhausen
        • Niedersachswerfen
Siemroth, J. (2008): Das Vorkommen von Boratmineralien im Werra-Anhydrit des Steinbruchs Kohnstein bei Niedersachswerfen am Südharz, Der Aufschluss, Vol. 59, 353-366
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