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Heidornite

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Kohnstein Quarry, Niedersachswerfen, Nordhausen, Harz Mts, Thuringia, Germany
© Thomas Witzke

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Formula:
Na
 
2
Ca
 
3
B
 
5
O
 
8
(SO
 
4
)
 
2
Cl(OH)
 
2
System:MonoclinicHardness:4 - 5
This page provides mineralogical data about Heidornite.

Classification of Heidornite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/K.04-40
Strunz 9th edition ID:6.EC.15
Nickel-Strunz 10th (pending) edition ID:6.EC.30

6 : BORATES
E : Pentaborates
C : Phyllo-pentaborates
Dana 8th edition ID:32.3.5.1

32 : COMPOUND SULFATES
3 : Anhydrous Compound Sulfates containing Hydroxyl or Halogen
Hey's CIM Ref.:10.3.2

10 : Borates with other anions
3 : Borates with sulphate
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Type Occurrence of Heidornite

Type Locality:Frenswegen 3 deep bore, Frenswegen, Nordhorn, Lower Saxony, Germany
Year of Discovery:1956

Physical Properties of Heidornite

Hardness (Mohs):4 - 5

Crystallography of Heidornite

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

Optical Data of Heidornite

Type:Biaxial (+)
RI values: nα = 1.579 nβ = 1.588 nγ = 1.604
2V:Measured: 63° to 77°, Calculated: 76°
Maximum Birefringence:δ = 0.025

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:very weak

Chemical Properties of Heidornite

Formula:
Na
 
2
Ca
 
3
B
 
5
O
 
8
(SO
 
4
)
 
2
Cl(OH)
 
2
Essential elements:B, Ca, Cl, H, Na, O, S
All elements listed in formula:B, Ca, Cl, H, Na, O, S

Relationship of Heidornite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.EC.05Biringuccite
Na
 
2
B
 
5
O
 
8
(OH)·H
 
2
O
6.EC.05Nasinite
Na
 
4
B
 
10
O
 
17
·5H
 
2
O
6.EC.10Gowerite
Ca[B
 
5
O
 
8
(OH)][B(OH)
 
3
]·3H
 
2
O
6.EC.15P-Veatchite
6.EC.15Veatchite
Sr
 
2
B
 
11
O
 
16
(OH)
 
5
·H
 
2
O
6.EC.20Volkovskite
KCa
 
4
[B
 
5
O
 
8
OH]
 
4
[B(OH)
 
3
]
 
2
Cl·4H
 
2
O
6.EC.25Tuzlaite
NaCaB
 
5
O
 
8
(OH)
 
2
·3H
 
2
O
6.EC.35Brianroulstonite
Ca
 
3
[B
 
5
O
 
6
(OH)
 
6
](OH)Cl
 
2
·8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
10.3.1Sulfoborite
Mg
 
3
[(OH,F)
 
2
|SO
 
4
|{B(OH)
 
4
}
 
2
]
10.3.3Charlesite
Ca
 
6
(Al,Si)
 
2
[(OH,O)
 
12
|B(OH)
 
4
|(SO
 
4
)
 
2
] · 26H
 
2
O

Other Names for Heidornite

Other Languages:
German:Heidornit
Russian:Хейдорнит
Spanish:Heidornita

Other Information

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

References for Heidornite

Reference List: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.

Neues Jahrbuch für Mineralogie, Monatshefte (1967): 157-169.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Heidornite

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  • Raman and XRD data at RRUFF project
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    Localities for Heidornite

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Lower Saxony
      • Nordhorn
        • Frenswegen
    		von Engelhardt, W., Füchtbauer, H., and Zemann, J. (1956): Contributions to Mineralogy and Petrology 5(3), 177-186.
    • Thuringia
      • Harz Mts
        • 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
    Mineral and/or Locality
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