Danburite (original) (raw)
A valid IMA mineral species - grandfathered
About DanburiteHide
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Colour:
Pale yellow, yellowish-brown, colourless
Specific Gravity:
2.93 - 3.02
Crystal System:
Orthorhombic
Name:
For the type locality at Danbury, Connecticut, USA.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1218:4
bd7009b2-2cac-4465-aaf1-ae08ccb866ac
IMA Classification of DanburiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
Classification of DanburiteHide
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9.FA.65
9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
56.3.1.1
56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
3 : Si2O7 Groups and O, OH, F, and H2O with[Si2O7] with borate groups
17.5.11
17 : Silicates Containing other Anions
5 : Borosilicates
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Dbu | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Dbr | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of DanburiteHide
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Transparency:
Transparent, Translucent
Colour:
Pale yellow, yellowish-brown, colourless
Cleavage:
Poor/Indistinct
Indistinct on {001}
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
2.93 - 3.02 g/cm3 (Measured) 2.99 g/cm3 (Calculated)
Optical Data of DanburiteHide
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RI values:
_n_α = 1.627 - 1.633 _n_β = 1.630 - 1.636 _n_γ = 1.633 - 1.639
2V:
Measured: 88° to 90°, Calculated: 88°
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Chemistry of DanburiteHide
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Common Impurities:
Fe,Mn,Al,Mg,Sr,Na
Crystallography of DanburiteHide
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Crystal System:
Orthorhombic
Class (H-M):
m m m _(_2/_m_2/_m_2/m ) - Dipyramidal
Cell Parameters:
a = 8.038(3) Å, b = 8.752(5) Å, c = 7.730 Å
Ratio:
a:b:c = 0.918 : 1 : 0.883
Unit Cell V:
543.79 ų (Calculated from Unit Cell)
Morphology:
Prismatic crystals, disseminated masses.
Comment:
Space Group: Pnam:
Crystallographic forms of DanburiteHide
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Crystal Atlas:
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Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000395 | Danburite | Phillips M W, Gibbs G V, Ribbe P H (1974) The crystal structure of danburite: A comparison with anorthite, albite, and reedmergnerite American Mineralogist 59 79-85 |  |
1974 | 0 | 293 | |
| 0017950 | Danburite | Dunbar C, Machatschki F (1931) The structure of danburite, CaB2Si2O8 _cod_database_code 1011048 Zeitschrift fur Kristallographie 76 133-145 | 1931 | 0 | 293 | ||
| 0010946 | Danburite | Sugiyama K, Takeuchi Y (1985) Unusual thermal expansion of a B-O bond in the structure of danburite CaB2Si2O8 Zeitschrift fur Kristallographie 173 293-304 | |
1985 | Toroku mine, Miyazaki Prefecture, Japan | 0 | 293 |
| 0010947 | Danburite | Sugiyama K, Takeuchi Y (1985) Unusual thermal expansion of a B-O-bond in the structure of danburite CaB2Si2O8 Zeitschrift fur Kristallographie 173 293-304 | |
1985 | Toroku mine, Miyazaki Prefecture, Japan | 0 | 293 |
| 0010948 | Danburite | Sugiyama K, Takeuchi Y (1985) Unusual thermal expansion of a B-O-bond in the structure of danburite CaB2Si2O8 Zeitschrift fur Kristallographie 173 293-304 | |
1985 | Toroku mine, Miyazaki Prefecture, Japan | 0 | 293 |
| 0010949 | Danburite | Sugiyama K, Takeuchi Y (1985) Unusual thermal expansion of a B-O-bond in the structure of danburite CaB2Si2O8 Zeitschrift fur Kristallographie 173 293-304 | |
1985 | Toroku mine, Miyazaki Prefecture, Japan | 0 | 293 |
| 0010950 | Danburite | Sugiyama K, Takeuchi Y (1985) Unusual thermal expansion of a B-O-bond in the structure of danburite CaB2Si2O8 Zeitschrift fur Kristallographie 173 293-304 | |
1985 | Toroku mine, Miyazaki Prefecture, Japan | 0 | 293 |
| 0010951 | Danburite | Sugiyama K, Takeuchi Y (1985) Unusual thermal expansion of a B-O-bond in the structure of danburite CaB2Si2O8 Zeitschrift fur Kristallographie 173 293-304 | |
1985 | Toroku mine, Miyazaki Prefecture, Japan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.57 Å | (100) |
| 2.961 Å | (80) |
| 2.743 Å | (65) |
| 2.655 Å | (55) |
| 2.729 Å | (40) |
| 1.435 Å | (40) |
| 3.65 Å | (35) |
Comments:
Maglovec Hill, Presov, Slovakia
Geological EnvironmentHide
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Geological Setting:
Granite and metamorphosed carbonates, evaporites.
Type Occurrence of DanburiteHide
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General Appearance of Type Material:
Scattered, subhedral, thick tabular, tan to brown crystals up to 2.5 cm in size in white, coarse-grained albite with lesser gray quartz. Crystals range from translucent to fractured and corroded.
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
Apparently dolomite-rich, high-grade metamorphic rock (outcrop lost).
Associated Minerals at Type Locality:
Reference:
Shepard, C.U. (1839) Notice of danburite, a new mineral species. American Journal of Science and Arts: 35: 137-139.
Synonyms of DanburiteHide
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Other Language Names for DanburiteHide
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Simplified Chinese:赛黄晶
Traditional Chinese:賽黃晶
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of DanburiteHide
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Charcas, Mexico crystals commonly fluoresce blue under SW or LW toward the clear terminations. Lower opaque portions may fluoresce yellow, green or both. Similar response from some Ural Mountains crystals. Weak white under SW or LW from Cristalmayu, Bolivia. Material from the type locality fluoresces moderately bright pale yellow to cream under SW, MW and LW.
Other InformationHide
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Thermal Behaviour:
Heated alone, before the blowpipe, it phosphoresces and fuses slowly, without swelling, into a white blebby, transparent glass (fusability scale 3.5), coloring the flame green due to boron. On cooling the glass becomes milky-white. With borax, it melts with effervescence into a transparent globule.
In a closed tube, it gives off some moisture, and phosphoresces brilliantly with a reddish yellow light.
Notes:
Slightly soluble in HCl, sufficiently so to give the reaction for boric acid with turmeric paper. Powdered danburite is slowly soluble.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Danburite in petrologyHide
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Internet Links for DanburiteHide
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References for DanburiteHide
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Reference List:
Localities for DanburiteHide
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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
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- 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). 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.