Dachiardite-Ca
A valid IMA mineral species - grandfathered
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About Dachiardite-Ca
Formula:
(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4 - 4½
Specific Gravity:
2.165 - 2.206
Crystal System:
Monoclinic
Member of:
Name:
Named after Antonio D'Achiardi (1839–1902), Professor of Mineralogy, Universitá di Pisa, Italy, who first described the mineral discovered by his son in a granitic pegmatite. Originally named only dachiardite, it was renamed in 1997 as dachiardite-Ca by the IMA.
Unique Identifiers
Mindat ID:
6895
Long-form identifier:
mindat:1:1:6895:2
GUID
(UUID V4):
(UUID V4):
6506cd64-e495-4fe4-9663-5931a9956687
IMA Classification of Dachiardite-Ca
Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Renamed by the IMA
IMA Formula:
Ca2(Si20Al4)O48 · 13H2O
First published:
1906
Approval history:
Renamed Dachiardite-Ca in 1997 (IMA special procedure)
Classification of Dachiardite-Ca
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
77.1.24.2
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 |
---|---|---|
Dac-Ca | 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-Ca
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
4 - 4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
On {001}, {100}
On {001}, {100}
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.165 - 2.206 g/cm3 (Measured) 2.1395(15) g/cm3 (Calculated)
Optical Data of Dachiardite-Ca
Type:
Biaxial (+)
RI values:
nα = 1.488 - 1.494 nβ = 1.490 - 1.496 nγ = 1.494 - 1.499
2V:
Measured: 58° to 73°, Calculated: 72° to 80°
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Chemistry of Dachiardite-Ca
Mindat Formula:
(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Crystallography of Dachiardite-Ca
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 18.625 Å, b = 7.508 Å, c = 10.247 Å
β = 108.056°
β = 108.056°
Ratio:
a:b:c = 2.481 : 1 : 1.365
Unit Cell V:
1,362.34 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Typically as bladed prismatic crystals, commonly fibrous. Radiating aggregates.
Twinning:
Material from Elba exhibits twinning on {110} as rare cyclical eightlings.
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) |
---|---|---|---|---|---|---|---|
0006381 | Dachiardite-Ca | Quartieri S, Vezzalini G, Alberti A (1990) Dachiardite from Hokiya-dake: evidence of a new topology European Journal of Mineralogy 2 187-193 | 1990 | Hokiya-dake, Japan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.452 Å | (100) |
3.204 Å | (100) |
1.873 Å | (75) |
8.90 Å | (50) |
6.91 Å | (50) |
4.97 Å | (50) |
4.88 Å | (50) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 3a: Earth’s earliest Hadean crust | >4.50 |
10 : Basalt-hosted zeolite minerals | |
Stage 3b: Earth’s earliest hydrosphere | >4.45 |
14 : Hot springs, geysers, and other subaerial geothermal minerals | |
16 : Low-𝑇 aqueous alteration of Hadean subaerial lithologies (see also #23) | |
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Dachiardite-Ca
Place of Conservation of Type Material:
Natural History Museum, Paris, France, 109.1084.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 123998.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 123998.
Reference:
D'Achiardi, G. (1906) Zeoliti del filone della speranza presso S. Piero in Campo (Elba). Atti della Societa Toscana di Scienze Naturali. Processi Verbali: 22: 150-165.
Other Language Names for Dachiardite-Ca
Russian:Дакиардит-Ca
Spanish:Dachiardita-Ca
Relationship of Dachiardite-Ca to other Species
Member of:
Other Members of this group:
Dachiardite-K | K4(Si20Al4O48) · 13H2O | Mon. |
Dachiardite-Na | (Na2,Ca,K2)5Al10Si38O96 · 25H2O | Mon. 2/m : B2/m |
Common Associates
Associated Minerals Based on Photo Data:
31 photos of Dachiardite-Ca associated with Mordenite | (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O |
19 photos of Dachiardite-Ca associated with Dachiardite-Na | (Na2,Ca,K2)5Al10Si38O96 · 25H2O |
11 photos of Dachiardite-Ca associated with Clinoptilolite-Ca | Ca3(Si30Al6)O72 · 20H2O |
7 photos of Dachiardite-Ca associated with Chalcedony | SiO2 |
5 photos of Dachiardite-Ca associated with Saponite | Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O |
4 photos of Dachiardite-Ca associated with Ferrierite-Na | (Na,K)5(Si31Al5)O72 · 18H2O |
3 photos of Dachiardite-Ca associated with Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
2 photos of Dachiardite-Ca associated with Pyrite | FeS2 |
1 photo of Dachiardite-Ca associated with Clinoptilolite Subgroup | M3-6(Si30Al6)O72 · 20H2O |
1 photo of Dachiardite-Ca associated with Phillipsite-Ca | Ca3(Si10Al6)O32 · 12H2O |
Related Minerals - Strunz-mindat Grouping
9.GD.05 | Gmelinite-Ca | Ca2(Si8Al4O24] · 11H2O |
9.GD.05 | Gmelinite-K | K4(Si8Al4O24) · 11H2O |
9.GD.05 | Gmelinite-Na | Na4(Si8Al4O24] · 11H2O |
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.10 | Chabazite-Mg | (Mg0.7K0.5Ca0.5Na0.1)[Al3Si9O24] · 10H2O |
9.GD.15 | Lévyne-Ca | (Ca,Na2,K2)[Al2Si4O12] · 6H2O |
9.GD.15 | Lévyne-Na | (Na2,Ca,K2)[Al2Si4O12] · 6H2O |
9.GD.20 | Bellbergite | (K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O |
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.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-Na | (Na2,Ca,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-Ca
mindat.org URL:
https://www.mindat.org/min-6895.html
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References for Dachiardite-Ca
Reference List:
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
Quartieri, Simona, Vezzalini, Giovanna, Alberti, Alberto (1990) Dachiardite from Hokiya-dake: evidence of a new topology. European Journal of Mineralogy, 2 (2) 187-193 doi:10.1127/ejm/2/2/0187
Coombs, Douglas S., Alberti, Alberto, Armbruster, Thomas, Artioli, Gilberto, Colella, Carmine, Galli, Ermanno, Grice, Joel D., Liebau, Friedrich, Mandarino, Joseph A., Minato, Hideo, Nickel, Ernest H., Passaglia, Elio, Peacor, Donald R., Quartieri, Simona, Rinaldi, Romano, Ross, Malcolm I., Sheppard, Richard A., Tillmanns, Ekkehart, Vezzalini, Giovanna (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-Ca
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).
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.
All localities listed without proper references should be considered as questionable.
Bulgaria | |
| Gellens et al. (1982) |
Encheva | |
Canada | |
| 176-178. +1 other reference |
Czech Republic | |
| Pauliš et al. (2008) |
| Pauliš P. et al.: Dachiardit-Ca z ... |
| Rychlý |
| P.Pauliš et al. (2014) |
Germany | |
| Belendorff (2021) |
Hungary | |
| Szakáll-Gatter-Szendrei: Mineral ... |
Italy | |
| G. D'Achiardi (1905) |
Orlandi et al. (1997) | |
Orlandi et al. (1997) +1 other reference | |
Japan | |
| Quartieri et al. (1990) |
| Quartieri et al. (1990) |
Slovakia | |
| Myšľan P et al. (2022) |
Myšľan P et al. (2022) | |
USA | |
| Micro Probe Volume IX Number 3 |
| Micro Probe Volume IX Number 3 Spring ... |
Rudy Tschernich Zeolite Collection |
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Csák Hill, Márianosztra, Szob District, Pest County, Hungary