Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Dachiardite

Big Photo

Opal Hill Mine, Mule Mts, Riverside Co., California, USA
© Dick Dionne

Show Dachiardite Photos (3)
Formula:
(Na,K,Ca
 
0
·5)
 
4
(Al
 
4
Si
 
20
)O
 
48
·18H
 
2
O
System:MonoclinicColour:Colourless
Hardness:4 - 4½
Name:Named after A. D'Achiardi


Zeolite group: series name.

Classification of Dachiardite

Dana 8th edition ID:77.1.6.4

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
Hey's CIM Ref.:16.10.22

16 : Silicates Containing Aluminum and other Metals
10 : Aluminosilicates of Ca and alkalis
mindat.org URL:http://www.mindat.org/min-1212.html
Please feel free to link to this page.

Physical Properties of Dachiardite

Colour:Colourless
Hardness (Mohs):4 - 4½

Crystallography of Dachiardite

Crystal System:Monoclinic
Cell Parameters:a = 18.03Å, b = 7.52Å, c = 10.2Å
β = 104.46°
Ratio:a:b:c = 2.398 : 1 : 1.356
Unit Cell Volume:V 1,339.16 ų (Calculated from Unit Cell)

Optical Data of Dachiardite

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°
Maximum Birefringence:δ = 0.006

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v strong

Chemical Properties of Dachiardite

Formula:
(Na,K,Ca
 
0
·5)
 
4
(Al
 
4
Si
 
20
)O
 
48
·18H
 
2
O
Essential elements:Al, H, Na, O, Si
All elements listed in formula:Al, Ca, H, K, Na, O, Si
Common Impurities:Fe,Sr,Cs

Relationship of Dachiardite to other Species

Related Minerals - Hey's Index Grouping:

- +
16.10.1Bytownite
(Ca,Na)[Al(Al,Si)Si
 
2
O
 
8
]
16.10.2Lisetite
CaNa
 
2
Al
 
4
Si
 
4
O
 
16
16.10.4Thomsonite-Ca
NaCa
 
2
[Al
 
5
Si
 
5
O
 
20
] · 6H
 
2
O
16.10.5Gonnardite
Na
 
2
Ca[Al
 
2
Si
 
3
O
 
10
]
 
2
 · 7H
 
2
O
16.10.6Mesolite
Na
 
2
Ca
 
2
[Al
 
2
Si
 
3
O
 
10
]
 
3
 · 8H
 
2
O
16.10.7Faujasite
16.10.8Garronite
Na
 
2
Ca
 
5
Al
 
12
Si
 
20
O
 
64
·27H
 
2
O
16.10.9Boggsite
Ca
 
8
Na
 
3
(Si,Al)
 
96
O
 
192
·70H
 
2
O
16.10.10Herschelite
16.10.11Phillipsite
16.10.12Fedorite
KNa
 
4
Ca
 
4
[HSi
 
4
O
 
10
]
 
4
 · 6H
 
2
O
16.10.13Willhendersonite
KCa[Al
 
3
Si
 
3
O
 
12
] · 5H
 
2
O
16.10.14Barrerite
(Na,K,Ca
 
0.5
)
 
2
[Al
 
2
Si
 
7
O
 
18
] · 7H
 
2
O
16.10.15Mordenite
(Na
 
2
,Ca,K
 
2
)Al
 
2
Si
 
10
O
 
24
·7H
 
2
O
16.10.16Reyerite
(Na,K)
 
2
Ca
 
14
(Si,Al)
 
24
O
 
58
(OH)
 
8
·6H
 
2
O
16.10.17Lévyne
16.10.18Clinoptilolite
16.10.19Heulandite
16.10.20Gobbinsite
Na
 
4
(Ca,Mg,K
 
2
)Al
 
6
Si
 
10
O
 
32
·12H
 
2
O
16.10.21Stilbite
16.10.23Offretite
KCaMgAl
 
5
Si
 
13
O
 
36
·16H
 
2
O or near
16.10.24Perlialite
K
 
9
Na(Ca,Sr)[Al
 
2
Si
 
4
O
 
12
]
 
6
 · 15H
 
2
O
16.10.25Erionite
16.10.26Paulingite
16.10.27Sodium Dachiardite
(Na
 
2
,Ca,K
 
2
)
 
4-5
Al
 
8
Si
 
40
O
 
96
·26H
 
2
O
16.10.28Mazzite-Mg
K
 
2
Mg
 
2
Ca
 
1.5
Al
 
9.5
Si
 
26.5
O
 
72
·28H
 
2
O or near
16.10.29Roggianite
Ca
 
2
Be(OH)
 
2
Al
 
2
Si
 
4
O
 
13
·2.5H
 
2
O

Other Names for Dachiardite

Synonyms:
AchiarditeZeolite Mimetica
Other Languages:
German:Achiardit
D'Achiardit
Dachiardit
Russian:Дакиардит
Spanish:Achiardita
Dachiardita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Dachiardite

Reference List:Bonatti S., Gottardi G. (1960) Dati ottici e strutturali sulla dachiardite. Periodico di Mineralogia, 103-108.

Gottardi G. (1960) Sul dimorfismo mordenite-dachiardite. Periodico di Mineralogia, 183-191.

Galli E. (1965) Lo spettro di polvere della dachiardite. Periodico di Mineralogia, 129-135.

Articles/Blogs about Dachiardite

Internet Links for Dachiardite

Search Engines:
  • Look for Dachiardite on Google
  • Look for Dachiardite images on Google
    • External Links:
  • Dachiardite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • Wendel Minerals - Auktion & Shop
  • Lapis Mineral Magazin
  • rare and unusual minerals mainly crystallized
  • Search for Dachiardite on minvision.com
  • Search for Dachiardite at Thames Valley Minerals
  • Wright's Rock Shop - excellent mineral specimens since 1970
  • Buy Minerals and Crystals from Crystalarium.com
  • Fabre Minerals - search for Dachiardite specimens
  • Top quality minerals from Kristalle of California
  • High-end worldwide specimens & outstanding customer service
  • Buy Fine Minerals from mineralsweb.com
  • Rare and Unusual minerals at Mineralogical Research Company
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    Localities for Dachiardite

    Hide Locality List
    The 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.
    These maps work faster with Firefox!
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Styria
      • Graz
        • Wildon
          • Weitendorf
    		R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
    Germany
     
    • Hesse
      • Vogelsberg
        • Ortenberg
    Hungary
     
    • Borsod-Abaúj-Zemplén Co.
      • Zempléni Mts.
        • Regéc
    		Szakáll & Jánosi: Minerals of Hungary, 1995
    USA
     
    • California
      • Los Angeles Co.
    		Mineral News v.14 no.9
          • Agoura
    		www.mineralsocal.org
      • Riverside Co.
        • Mule Mts
    Mineral and/or Locality
    Google
     
    www.mindat.org Web
    Copyright © Jolyon & Ida Ralph 1993-2008. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register.