Dachiardite-Ca (original) (raw)
A valid IMA mineral species - grandfathered
About Dachiardite-CaHide
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Formula:
(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Specific Gravity:
2.165 - 2.206
Crystal System:
Monoclinic
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 IdentifiersHide
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Long-form identifier:
mindat:1:1:6895:2
6506cd64-e495-4fe4-9663-5931a9956687
IMA Classification of Dachiardite-CaHide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Renamed by the IMA
IMA Formula:
Ca2(Si20Al4)O48 · 13H2O
Approval history:
Renamed Dachiardite-Ca in 1997 (IMA special procedure)
Type description reference:
Classification of Dachiardite-CaHide
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9.GD.40
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
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.
| 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-CaHide
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Cleavage:
Perfect
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-CaHide
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RI values:
_n_α = 1.488 - 1.494 _n_β = 1.490 - 1.496 _n_γ = 1.494 - 1.499
2V:
Measured: 58° to 73°, Calculated: 72° to 80°
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Chemistry of Dachiardite-CaHide
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Mindat Formula:
(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Crystallography of Dachiardite-CaHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 18.625 Å, b = 7.508 Å, c = 10.247 Å
β = 108.056°
Ratio:
a:b:c = 2.481 : 1 : 1.365
Unit Cell V:
1,362.34 ų (Calculated from Unit Cell)
Morphology:
Typically as bladed prismatic crystals, commonly fibrous. Radiating aggregates.
Twinning:
Material from Elba exhibits twinning on {110} as rare cyclical eightlings.
Crystal StructureHide
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| 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 DiffractionHide
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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 EnvironmentHide
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Type Occurrence of Dachiardite-CaHide
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Place of Conservation of Type Material:
Natural History Museum, Paris, France, 109.1084.
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-CaHide
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Relationship of Dachiardite-Ca to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 9.GD.05 | Gmelinite-Ca | Ca2(Si8Al4)O24 · 11H2O | Hex. 6/m m m _(_6/_m_2/_m_2/m ) : _P_63/m m c |
|---|---|---|---|
| 9.GD.05 | Gmelinite-K | K4(Si8Al4O24) · 11H2O | Hex. 6/m m m _(_6/_m_2/_m_2/m ) : _P_63/m m c |
| 9.GD.05 | Gmelinite-Na | Na4(Si8Al4)O24 · 11H2O | Hex. 6/m m m _(_6/_m_2/_m_2/m ) : _P_63/m m c |
| 9.GD.10 | Willhendersonite | KCa[Al3Si3O12] · 5H2O | Tric. 1 : _P_1 |
| 9.GD.10 | Chabazite-Ca | (Ca,K2,Na2)2[Al2Si4O12]2 · 12H2O | Tric. 1 : _P_1 |
| 9.GD.10 | Chabazite-K | (K2,Ca,Na2,Sr,Mg)2[Al2Si4O12]2 · 12H2O | Trig. 3_m_ _(_32/m ) : R_3_m |
| 9.GD.10 | Chabazite-Na | (Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O | Trig. 3_m_ : R_3_m |
| 9.GD.10 | Chabazite-Sr | Sr2[Al2Si4O12]2 · 12H2O | Trig. 3_m_ _(_32/m ) : R_3_m |
| 9.GD.10 | Chabazite-Mg | (Mg0.7K0.5Ca0.5Na0.1)[Al3Si9O24] · 10H2O | Trig. 3_m_ _(_32/m ) : R_3_m |
| 9.GD.15 | Lévyne-Ca | (Ca,Na2,K2)[Al2Si4O12] · 6H2O | Trig. 3_m_ _(_32/m ) : R_3_m |
| 9.GD.15 | Lévyne-Na | (Na2,Ca,K2)[Al2Si4O12] · 6H2O | Trig. 3_m_ _(_32/m ) : R_3_m |
| 9.GD.20 | Bellbergite | (K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O | Hex. |
| 9.GD.20 | Erionite-Ca | (Ca,K2,Na2)2[Al4Si14O36] · 15H2O | Hex. 6/m m m _(_6/_m_2/_m_2/m ) : _P_63/m m c |
| 9.GD.20 | Erionite-K | (K2,Ca,Na2)2[Al4Si14O36] · 15H2O | Hex. 6/m m m _(_6/_m_2/_m_2/m ) : _P_63/m m c |
| 9.GD.20 | Erionite-Na | (Na2,K2,Ca)2[Al4Si14O36] · 15H2O | Hex. 6/m m m _(_6/_m_2/_m_2/m ) : _P_63/m m c |
| 9.GD.25 | Offretite | KCaMg(Si13Al5)O36 · 15H2O | Hex. 6_m_2 : _P_6_m_2 |
| 9.GD.25 | Wenkite | (Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2O | Hex. 6_m_2 : P_62_m |
| 9.GD.30 | Faujasite-Ca | (Ca,Na2,Mg)3.5[Al7Si17O48] · 32H2O | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 9.GD.30 | Faujasite-Mg | (Mg,Na2,Ca)3.5[Al7Si17O48] · 32H2O | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 9.GD.30 | Faujasite-Na | (Na2,Ca,Mg)3.5[Al7Si17O48] · 32H2O | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 9.GD.35 | Maricopaite | Pb7Ca2(Si,Al)48O100 · 32H2O | Orth. |
| 9.GD.35 | Mordenite | (Na2,Ca,K2)4(Al8Si40)O96 · 28H2O | Orth. |
| 9.GD.40 | Dachiardite-K | K4(Si20Al4O48) · 13H2O | Mon. |
| 9.GD.40 | Dachiardite-Na | (Na2,Ca,K2)5Al10Si38O96 · 25H2O | Mon. 2/m : _B_2/m |
| 9.GD.45 | Epistilbite | CaAl2Si6O16 · 5H2O | Mon. |
| 9.GD.50 | Ferrierite-K | (K,Na)5(Si31Al5)O72 · 18H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : I m m m |
| 9.GD.50 | Ferrierite-Mg | [Mg2(K,Na)2Ca0.5](Si29Al7)O72 · 18H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n m |
| 9.GD.50 | Ferrierite-Na | (Na,K)5(Si31Al5)O72 · 18H2O | Mon. 2/m |
| 9.GD.50 | Ferrierite-NH4 | (NH4,Mg0.5)5(Al5Si31O72) · 22H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : I m m m |
| 9.GD.55 | Bikitaite | LiAlSi2O6 · H2O | Tric. 1 : _P_1 |
Other InformationHide
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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-CaHide
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References for Dachiardite-CaHide
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Reference List:
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-CaHide
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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.