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Dachiardite

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

Show Dachiardite Photos (7)
System:MonoclinicColour:Colourless
Hardness:4 - 4½
Name:Named after A. D'Achiardi
Synonym of:Dachiardite-Ca, Dachiardite-Na


Zeolite Group.
Name for unspecified member within the series between dachiardite-Ca and dachiardite-Na.

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
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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

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
(Na,K)
 
2-3
(Ca
 
4
Na
 
3
)Si
 
16
O
 
38
F
 
2
 · 3.5H
 
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.

Internet Links for Dachiardite

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    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.
    (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
    Japan
     
    • Tokyo Prefecture
      • Ogasawara Islands
        • Chichijima Group
          • Chichi Island (Chichijima)
    		Mineralogical Journal Vol. 11 (1982) , No. 1 pp1-14
    Mineralogical Journal Vol. 11 (1982) , No. 1 pp1-14
    New Zealand
     
    • South Island
      • Canterbury
    		Jesse Crawford specimen
    USA
     
    • California
      • Los Angeles Co.
    		Mineral News v.14 no.9
          • Agoura
    		www.mineralsocal.org
      • Riverside Co.
        • Mule Mts
    Mineral and/or Locality
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