Dachiardite-K
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
Formula:
K4(Si20Al4O48) · 13H2O
Colour:
Snow-white
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.18
Crystal System:
Monoclinic
Member of:
Name:
For being the K-dominant member of the dachiardite series, named according to the IMA nomenclature for zeolites.
Unique Identifiers
Mindat ID:
46790
Long-form identifier:
mindat:1:1:46790:0
GUID
(UUID V4):
(UUID V4):
b51f7cb7-5ddb-44a1-8f94-11fafe2be156
IMA Classification of Dachiardite-K
Approved
IMA Formula:
K4(Si20Al4)O48 · 13H2O
Approval year:
2015
First published:
2016
Classification of Dachiardite-K
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
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-K | 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-K
Vitreous
Transparency:
Translucent
Colour:
Snow-white
Streak:
White
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
(100)
(100)
Fracture:
Step-Like
Density:
2.18 g/cm3 (Measured) 2.169 g/cm3 (Calculated)
Optical Data of Dachiardite-K
Type:
Biaxial (+)
RI values:
nα = 1.477 nβ = 1.478 nγ = 1.481
2V:
Measured: 65°
Max Birefringence:
δ = 0.004
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:
distinct (r
Chemistry of Dachiardite-K
Mindat Formula:
K4(Si20Al4O48) · 13H2O
Crystallography of Dachiardite-K
Crystal System:
Monoclinic
Cell Parameters:
a = 18.670(8) Å, b = 7.511(3) Å, c = 10.231(4) Å
β = 107.79(3)°
β = 107.79(3)°
Ratio:
a:b:c = 2.486 : 1 : 1.362
Unit Cell V:
1,366.09 ų (Calculated from Unit Cell)
Morphology:
Radial groups of acicular crystals.
Comment:
space group C2/m, Cm or C2
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.76 Å | (24) |
8.85 Å | (58) |
4.985 Å | (13) |
4.870 Å | (59) |
3.807 Å | (16) |
3.768 Å | (20) |
3.457 Å | (100) |
2.966 Å | (17) |
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-K
General Appearance of Type Material:
spherical, radial aggregates (up to 8 mm in diameter)
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Earth and Man National Museum, Sofia, Bulgaria, registration number 23927.
Geological Setting of Type Material:
Opal-chalcedony veins
Associated Minerals at Type Locality:
Reference:
Chukanov, N.V., Encheva, S., Petrov, P., Pekov, I.V., Belakovskiy, D.I., Britvin, S.N., Aksenov, S.M. (2016) Dachiardite-K, (K2Ca)(Al4Si20O48)·13H2O, a new zeolite from the Eastern Rhodopes, Bulgaria (in Russian). Zapiski Rossiiskogo Mineralogicheskogo Obshchetstva: 145(1) 68-79.
Synonyms of Dachiardite-K
Other Language Names for Dachiardite-K
Spanish:Dachiardita-K
Relationship of Dachiardite-K to other Species
Member of:
Other Members of this group:
Dachiardite-Ca | (Ca,Na2,K2)5Al10Si38O96 · 25H2O | Mon. 2/m : B2/m |
Dachiardite-Na | (Na2,Ca,K2)5Al10Si38O96 · 25H2O | Mon. 2/m : B2/m |
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-Ca | (Ca,Na2,K2)5Al10Si38O96 · 25H2O |
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-K
mindat.org URL:
https://www.mindat.org/min-46790.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Dachiardite-K
Localities for Dachiardite-K
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 (TL) | |
| Encheva +1 other reference |
Quick NavTopUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsStrunz-MindatOther InformationInternet Links References Localities Locality List