Heidornite
A valid IMA mineral species - grandfathered
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About Heidornite
Formula:
Na2Ca3B5O8(SO4)2Cl(OH)2
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
2.753
Crystal System:
Monoclinic
Name:
Named in honour of Dr. Fritz Hans Otto Heidorn (1899 - ?), senior petroleum geologist for C. Deilmann Bergbau GmbH in Bentheim, Germany, for his scientific study of the Zechstein deposits.
This page provides mineralogical data about Heidornite.
Unique Identifiers
Mindat ID:
1846
Long-form identifier:
mindat:1:1:1846:9
IMA Classification of Heidornite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Na2Ca3B5O8(S6+O4)2(OH)2Cl
First published:
1956
Type description reference:
Classification of Heidornite
6.EC.30
6 : BORATES
E : Pentaborates
C : Phyllo-pentaborates
6 : BORATES
E : Pentaborates
C : Phyllo-pentaborates
32.3.5.1
32 : COMPOUND SULFATES
3 : Anhydrous Compound Sulfates containing Hydroxyl or Halogen
32 : COMPOUND SULFATES
3 : Anhydrous Compound Sulfates containing Hydroxyl or Halogen
10.3.2
10 : Borates with other anions
3 : Borates with sulphate
10 : Borates with other anions
3 : Borates with sulphate
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Hdn | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Heidornite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
4 - 5 on Mohs scale
Cleavage:
Perfect
{001}
{001}
Density:
2.753(2) g/cm3 (Measured) 2.70 g/cm3 (Calculated)
Optical Data of Heidornite
Type:
Biaxial (+)
RI values:
nα = 1.579(5) nβ = 1.588(5) nγ = 1.604(5)
2V:
Measured: 73° to 77°, Calculated: 74°
Max. Birefringence:
δ = 0.025
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
very weak
Chemistry of Heidornite
Mindat Formula:
Na2Ca3B5O8(SO4)2Cl(OH)2
Element Weights:
Crystallography of Heidornite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 10.19 Å, b = 7.76 Å, c = 18.81 Å
β = 93.33°
β = 93.33°
Ratio:
a:b:c = 1.313 : 1 : 2.424
Unit Cell V:
1,484.88 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Steeply dipyramidal showing {110}, {111}, {112}
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014732 | Heidornite | Burzlaff H (1967) Die struktur des heidornit Ca3Na2Cl(SO4)2B5O8(OH)2 Neues Jahrbuch fur Mineralogie, Monatshefte 1967 157-169 | 1967 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.11 Å | (vs) |
| 3.77 Å | (s) |
| 2.74 Å | (s) |
| 2.96 Å | (ms) |
| 2.90 Å | (m) |
| 2.81 Å | (m) |
| 2.54 Å | (m) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) |
Type Occurrence of Heidornite
Place of Conservation of Type Material:
Natural History Museum, London, England, 1957,370.
Harvard University, Cambridge, Massachusetts, USA, 109587.
Harvard University, Cambridge, Massachusetts, USA, 109587.
Geological Setting of Type Material:
Marine evaporite deposit
Associated Minerals at Type Locality:
Other Language Names for Heidornite
Common Associates
Associations Based on Photo Data:
| 1 photo of Heidornite associated with Anhydrite | CaSO4 |
| 1 photo of Heidornite associated with Glauberite | Na2Ca(SO4)2 |
Related Minerals - Strunz-mindat Grouping
| 6.EC. | Calcioveatchite | SrCaB11O16(OH)5 · 5H2O |
| 6.EC.05 | Nasinite | Na2[B5O8(OH)] · 2H2O |
| 6.EC.05 | Biringuccite | Na2B5O8(OH) · H2O |
| 6.EC.10 | Gowerite | Ca[B5O8(OH)][B(OH)3] · 3H2O |
| 6.EC.15 | 'Veatchite-2M' | Sr2B11O16(OH)5 · H2O |
| 6.EC.15 | 'Veatchite-A' | Sr2B11O16(OH)5 · H2O |
| 6.EC.15 | Veatchite | Sr2B11O16(OH)5 · H2O |
| 6.EC.15 | 'Veatchite-1M' | Sr2B11O16(OH)5 · H2O |
| 6.EC.20 | Volkovskite | KCa4[B5O8OH]4[B(OH)3]2Cl · 4H2O |
| 6.EC.25 | Tuzlaite | NaCaB5O8(OH)2 · 3H2O |
| 6.EC.35 | Popugaevaite | Ca3[B5O6(OH)6]FCl2 · 8H2O |
| 6.EC.35 | Brianroulstonite | Ca3[B5O6(OH)6](OH)Cl2 · 8H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Heidornite
mindat.org URL:
https://www.mindat.org/min-1846.html
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Please feel free to link to this page.
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References for Heidornite
Localities for Heidornite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| Engelhardt et al. (1956) |
| Siemroth (2008) |
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Kohnstein Quarry, Niedersachswerfen, Harztor, Nordhausen District, Thuringia, Germany