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Heidornite

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Big Photo

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
[B(OH)
 
4
]
 
2
(SO
 
4
)(OH,F)
 
2
10.3.3Charlesite
Ca
 
6
(Al,Si)
 
2
(SO
 
4
)
 
2
[B(OH)
 
4
](OH,O)
 
12
 · 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

    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.
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    (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
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Jun 2011 18:44:05
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    Updated Mineral Entry: BuseckiteFrom Bela Feher, 12th Feb 2012 19:38:37