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Dachiardite-K

A valid IMA mineral species
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01912660014948941375483.jpg
Antonio D'Achiardi
Formula:
K4(Si20Al4O48) · 13H2O
Colour:
Snow-white
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.18
Crystal System:
Monoclinic
Name:
For being the K-dominant member of the dachiardite series, named according to the IMA nomenclature for zeolites.
The potassium-dominant member of the Dachiardite series of the Zeolite Group.


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Unique IdentifiersHide

Mindat ID:
46790
Long-form identifier:
mindat:1:1:46790:0
GUID
(UUID V4):
b51f7cb7-5ddb-44a1-8f94-11fafe2be156

IMA Classification of Dachiardite-KHide

Classification of Dachiardite-KHide

9.GD.40

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
D : Chains of 6-membered rings – tabular zeolites

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
Dac-KIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of Dachiardite-KHide

Vitreous
Transparency:
Translucent
Colour:
Snow-white
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
(100)
Fracture:
Step-Like
Density:
2.18 g/cm3 (Measured)    2.169 g/cm3 (Calculated)

Optical Data of Dachiardite-KHide

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.
Surface Relief:
Moderate
Dispersion:
distinct (r

Chemistry of Dachiardite-KHide

Mindat Formula:
K4(Si20Al4O48) · 13H2O

Crystallography of Dachiardite-KHide

Crystal System:
Monoclinic
Cell Parameters:
a = 18.670(8) Å, b = 7.511(3) Å, c = 10.231(4) Å
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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):

Type Occurrence of Dachiardite-KHide

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-KHide

Other Language Names for Dachiardite-KHide

Relationship of Dachiardite-K to other SpeciesHide

Other Members of this group:
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2OMon. 2/m : B2/m
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2OMon. 2/m : B2/m

Related Minerals - Strunz-mindat GroupingHide

9.GD.05Gmelinite-CaCa2(Si8Al4O24] · 11H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.GD.05Gmelinite-KK4(Si8Al4O24) · 11H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.GD.05Gmelinite-NaNa4(Si8Al4O24] · 11H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.GD.10WillhendersoniteKCa[Al3Si3O12] · 5H2OTric. 1 : P1
9.GD.10Chabazite-Ca(Ca,K2,Na2)2[Al2Si4O12]2 · 12H2OTric. 1 : P1
9.GD.10Chabazite-K(K2,Ca,Na2,Sr,Mg)2[Al2Si4O12]2 · 12H2OTrig. 3m (3 2/m) : R3m
9.GD.10Chabazite-Na(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2OTrig. 3m : R3m
9.GD.10Chabazite-SrSr2[Al2Si4O12]2 · 12H2OTrig. 3m (3 2/m) : R3m
9.GD.10Chabazite-Mg(Mg0.7K0.5Ca0.5Na0.1)[Al3Si9O24] · 10H2O Trig. 3m (3 2/m) : R3m
9.GD.15Lévyne-Ca(Ca,Na2,K2)[Al2Si4O12] · 6H2OTrig. 3m (3 2/m) : R3m
9.GD.15Lévyne-Na(Na2,Ca,K2)[Al2Si4O12] · 6H2OTrig. 3m (3 2/m) : R3m
9.GD.20Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2OHex.
9.GD.20Erionite-Ca(Ca,K2,Na2)2[Al4Si14O36] · 15H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.GD.20Erionite-K(K2,Ca,Na2)2[Al4Si14O36] · 15H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.GD.20Erionite-Na(Na2,K2,Ca)2[Al4Si14O36] · 15H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.GD.25OffretiteKCaMg(Si13Al5)O36 · 15H2OHex. 6 m2 : P6m2
9.GD.25Wenkite(Ba,K)4(Ca,Na)6[(Si,Al)20O39(OH)2](SO4)3 · 0.5H2OHex. 6 m2 : P62m
9.GD.30Faujasite-Ca(Ca,Na2,Mg)3.5[Al7Si17O48] · 32H2OIso. m3m (4/m 3 2/m) : Fd3m
9.GD.30Faujasite-Mg(Mg,Na2,Ca)3.5[Al7Si17O48] · 32H2OIso. m3m (4/m 3 2/m) : Fd3m
9.GD.30Faujasite-Na(Na2,Ca,Mg)3.5[Al7Si17O48] · 32H2OIso. m3m (4/m 3 2/m) : Fd3m
9.GD.35MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
9.GD.35Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2OOrth.
9.GD.40Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2OMon. 2/m : B2/m
9.GD.40Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2OMon. 2/m : B2/m
9.GD.45EpistilbiteCaAl2Si6O16 · 5H2OMon.
9.GD.50Ferrierite-K(K,Na)5(Si31Al5)O72 · 18H2OOrth. mmm (2/m 2/m 2/m) : Immm
9.GD.50Ferrierite-Mg[Mg2(K,Na)2Ca0.5](Si29Al7)O72 · 18H2OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.GD.50Ferrierite-Na(Na,K)5(Si31Al5)O72 · 18H2OMon. 2/m
9.GD.50Ferrierite-NH4(NH4,Mg0.5)5(Al5Si31O72) · 22H2OOrth. mmm (2/m 2/m 2/m) : Immm
9.GD.55BikitaiteLiAlSi2O6 · H2OTric. 1 : P1

Other InformationHide

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-KHide

References for Dachiardite-KHide

Reference List:

Localities for Dachiardite-KHide

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

- 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.
Bulgaria (TL)
 
  • Kardzhali Province
    • Momchilgrad Municipality
      • Zvezdel
Encheva +1 other reference
 
矿物 and/or 产地  
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