Dachiardite-Na
A valid IMA mineral species
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About Dachiardite-Na
Antonio D'Achiardi
Formula:
(Na2,Ca,K2)5Al10Si38O96 · 25H2O
Colour:
Colorless, red-orange
Lustre:
Vitreous
Hardness:
4 - 4½
Specific Gravity:
2.16
Crystal System:
Monoclinic
Member of:
Name:
Originally referred to as sodium-rich dachiardite. Renamed to the current form in 1997 (Coombs, et al), as the Na-dominant member of the dachiardite series. The root name is in honor of Antonio D'Achiardi (1839–1902), Professor of Mineralogy, Universitá di Pisa, Italy, who first described dachiardite-(Ca).
Unique Identifiers
Mindat ID:
6896
Long-form identifier:
mindat:1:1:6896:9
Similar Names
| Dachiardite-Ca | A valid IMA mineral species - grandfathered | (Ca,Na2,K2)5Al10Si38O96 · 25H2O |
IMA Classification of Dachiardite-Na
Approved
IMA Formula:
Na4(Si20Al4)O48·13H2O
First published:
1975
Classification of Dachiardite-Na
9.GD.40
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
D : Chains of 6-membered rings – tabular zeolites
9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
D : Chains of 6-membered rings – tabular zeolites
77.1.6.5
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
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 |
|---|---|---|
| Dac-Na | 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 Dachiardite-Na
Vitreous
Transparency:
Transparent
Colour:
Colorless, red-orange
Streak:
White
Hardness:
4 - 4½ on Mohs scale
Density:
2.16(1) g/cm3 (Measured) 2.17 g/cm3 (Calculated)
Optical Data of Dachiardite-Na
Type:
Biaxial (+)
RI values:
nα = 1.488 - 1.494 nβ = 1.49 - 1.496 nγ = 1.494 - 1.499
2V:
Measured: 58° to 73°, Calculated: 72° to 80°
Max. Birefringence:
δ = 0.005 - 0.006
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:
r > v strong
Chemistry of Dachiardite-Na
Mindat Formula:
(Na2,Ca,K2)5Al10Si38O96 · 25H2O
Element Weights:
Crystallography of Dachiardite-Na
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 18.647(7) Å, b = 7.506(4) Å, c = 10.296(4) Å
β = 108.37(3)°
β = 108.37(3)°
Ratio:
a:b:c = 2.484 : 1 : 1.372
Unit Cell V:
1,367.64 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.84 Å | (100) |
| 4.883 Å | (100) |
| 3.957 Å | (30) |
| 3.801 Å | (40) |
| 3.454 Å | (85) |
| 2.971 Å | (37) |
| 2.865 Å | (23) |
Comments:
Alberti, 1975.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 9 : Lava/xenolith minerals (hornfels, sanidinite facies) | |
| 10 : Basalt-hosted zeolite minerals | |
| Stage 3b: Earth’s earliest hydrosphere | >4.45 |
| 14 : Hot springs, geysers, and other subaerial geothermal minerals | |
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Dachiardite-Na
General Appearance of Type Material:
Thin, parallel fibers.
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
Basalt.
Associated Minerals at Type Locality:
Synonyms of Dachiardite-Na
Other Language Names for Dachiardite-Na
Relationship of Dachiardite-Na to other Species
Member of:
Other Members of Dachiardite Subgroup:
| Dachiardite-Ca | (Ca,Na2,K2)5Al10Si38O96 · 25H2O | Mon. 2/m : B2/m |
| Dachiardite-K | K4(Si20Al4O48) · 13H2O | Mon. |
Common Associates
Associations Based on Photo Data:
| 27 photos of Dachiardite-Na associated with Mordenite | (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O |
| 19 photos of Dachiardite-Na associated with Dachiardite-Ca | (Ca,Na2,K2)5Al10Si38O96 · 25H2O |
| 11 photos of Dachiardite-Na associated with Calcite | CaCO3 |
| 8 photos of Dachiardite-Na associated with 'Chalcedony' | SiO2 |
| 6 photos of Dachiardite-Na associated with Clinoptilolite-Ca | Ca3(Si30Al6)O72 · 20H2O |
| 5 photos of Dachiardite-Na associated with Pyrite | FeS2 |
| 5 photos of Dachiardite-Na associated with Weloganite | Na2Sr3Zr(CO3)6 · 3H2O |
| 5 photos of Dachiardite-Na associated with Quartz | SiO2 |
| 5 photos of Dachiardite-Na associated with Clinoptilolite Subgroup | (Na/Ca/K)3-6[Al6-7Si29-30O72] · 20H2O |
| 4 photos of Dachiardite-Na associated with Ferrierite Subgroup |
Related Minerals - Strunz-mindat Grouping
| 9.GD.05 | Gmelinite-Ca | Ca2(Si8Al4)O24 · 11H2O |
| 9.GD.05 | Gmelinite-K | K4(Si8Al4O24) · 11H2O |
| 9.GD.05 | Gmelinite-Na | Na4(Si8Al4)O24 · 11H2O |
| 9.GD.10 | Chabazite-Mg | (Mg0.7K0.5Ca0.5Na0.1)[Al3Si9O24] · 10H2O |
| 9.GD.10 | Willhendersonite | KCa[Al3Si3O12] · 5H2O |
| 9.GD.10 | Chabazite-Ca | (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O |
| 9.GD.10 | Chabazite-K | (K2,Ca,Na2,Sr,Mg)2[Al2Si4O12]2 · 12H2O |
| 9.GD.10 | Chabazite-Na | (Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O |
| 9.GD.10 | Chabazite-Sr | Sr2[Al2Si4O12]2 · 12H2O |
| 9.GD.15 | Lévyne-Ca | (Ca,Na2,K2)[Al2Si4O12] · 6H2O |
| 9.GD.15 | Lévyne-Na | (Na2,Ca,K2)[Al2Si4O12] · 6H2O |
| 9.GD.20 | Erionite-Ca | (Ca,K2,Na2)2[Al4Si14O36] · 15H2O |
| 9.GD.20 | Erionite-K | (K2,Ca,Na2)2[Al4Si14O36] · 15H2O |
| 9.GD.20 | Erionite-Na | (Na2,K2,Ca)2[Al4Si14O36] · 15H2O |
| 9.GD.20 | Bellbergite | (K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O |
| 9.GD.25 | Offretite | KCaMg(Si13Al5)O36 · 15H2O |
| 9.GD.25 | Wenkite | (Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2O |
| 9.GD.30 | Faujasite-Ca | (Ca,Na2,Mg)3.5[Al7Si17O48] · 32H2O |
| 9.GD.30 | Faujasite-Mg | (Mg,Na2,Ca)3.5[Al7Si17O48] · 32H2O |
| 9.GD.30 | Faujasite-Na | (Na2,Ca,Mg)3.5[Al7Si17O48] · 32H2O |
| 9.GD.35 | Maricopaite | Pb7Ca2(Si,Al)48O100 · 32H2O |
| 9.GD.35 | Mordenite | (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O |
| 9.GD.40 | Dachiardite-K | K4(Si20Al4O48) · 13H2O |
| 9.GD.40 | Dachiardite-Ca | (Ca,Na2,K2)5Al10Si38O96 · 25H2O |
| 9.GD.45 | Epistilbite | CaAl2Si6O16 · 5H2O |
| 9.GD.50 | Ferrierite-K | (K,Na)5(Si31Al5)O72 · 18H2O |
| 9.GD.50 | Ferrierite-Mg | [Mg2(K,Na)2Ca0.5](Si29Al7)O72 · 18H2O |
| 9.GD.50 | Ferrierite-Na | (Na,K)5(Si31Al5)O72 · 18H2O |
| 9.GD.50 | Ferrierite-NH4 | (NH4,Mg0.5)5(Al5Si31O72) · 22H2O |
| 9.GD.55 | Bikitaite | LiAlSi2O6 · H2O |
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 Dachiardite-Na
mindat.org URL:
https://www.mindat.org/min-6896.html
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References for Dachiardite-Na
Reference List:
Alberti, Alberto (1975) Sodium-rich dachiardite from Alpe di Siusi, Italy. Contributions to Mineralogy and Petrology, 49 (1) 63-66 doi:10.1007/bf00371079
Alberti, Alberto (1975) Sodium-rich dachiardite from Alpe di Siusi, Italy. Contributions to Mineralogy and Petrology, 49 (1) 63-66 doi:10.1007/bf00371079
Bonardi, Maurizio (1979) Composition of type dachiardite from Elba: a re-examination. Mineralogical Magazine, 43 (328) 548-549 doi:10.1180/minmag.1979.043.328.19
Bonardi, M., Roberts, A. C., Sabina, A. P. (1981) Sodium-rich dachiardite from the Francon quarry, Montreal Island, Quebec. The Canadian Mineralogist, 19 (2) 285-289
Bargar, K. E., Erd, R. C., Keith, T. E. C., Beeson, M. H. (1987) Dachiardite from Yellowstone National Park, Wyoming. The Canadian Mineralogist, 25 (3) 475-483
Coombs, Douglas S., Alberti, Alberto, Armbruster, Thomas, Artioli, Gilberto, Colella, Carmine, Galli, Ermanno, Grice, Joel D., Liebau, Friedrich, Mandarino, Joseph A., Minato, Hideo, et al. (1997) Recommended nomenclature for zeolite minerals; report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. The Canadian Mineralogist, 35 (6). 1571-1606
Localities for Dachiardite-Na
Showing 24 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.
Austria | |
| Niedermayr (1997) |
| Postl et al. (1983) +2 other references |
Bulgaria | |
| Encheva |
Canada | |
| 176-178. +3 other references |
Germany | |
| Wittern (2001) |
Italy | |
| Exel (1987) |
| Exel (1987) |
| Exel (1987) | |
| Exel (1987) | |
| Exel (1987) | |
| Pedroni (1996) +1 other reference |
| Exel (1980) +3 other references |
| Exel (1987) | |
| Exel (1987) | |
Japan | |
| Yoshimura et al. (1977) |
Mexico | |
| Verhagen et al. (2023) |
Ukraine | |
| World of Stones v.9 | |
| Tischenko A. data |
USA | |
| Micro Probe Vol. 9 No 3 +1 other reference |
| Micro Probe Volume IX Number 3 Spring ... +1 other reference |
| - (n.d.) | |
| Bargar +1 other reference |
| Bargar +1 other reference |
| Tschernich (1992) |
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