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Dachiardite-Na

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Roadcuts, Altoona, Wahkiakum Co., Washington, USA
© Dick Dionne

Show Dachiardite-Na Photos (6)
Formula:
(Na
 
2
,Ca,K
 
2
)
 
5
Al
 
10
Si
 
38
O
 
96
·25H
 
2
O
System:MonoclinicLustre:Vitreous
Hardness:4 - 4½
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. The Na-dominant member of the dachiardite series.


Zeolite Group.
The Na analogue of Dachiardite-Ca.

Classification of Dachiardite-Na

IMA status:Approved
Strunz 8th edition ID:8/J.22-15
Nickel-Strunz 10th (pending) edition ID:9.GD.40

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
D : Chains of 6-membered rings – tabular zeolites
Dana 8th edition ID:77.1.6.5

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
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Type Occurrence of Dachiardite-Na

Type Locality:La Palaccia (Auf der Schneid), Duron Valley, Fassa Valley, Trento Province, Trentino-Alto Adige, Italy

Physical Properties of Dachiardite-Na

Lustre:Vitreous
Hardness (Mohs):4 - 4½

Crystallography of Dachiardite-Na

Crystal System:Monoclinic

Optical Data of Dachiardite-Na

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-Na

Formula:
(Na
 
2
,Ca,K
 
2
)
 
5
Al
 
10
Si
 
38
O
 
96
·25H
 
2
O
Essential elements:Al, H, Na, O, Si
All elements listed in formula:Al, Ca, H, K, Na, O, Si

Relationship of Dachiardite-Na to other Species

Member of Group:
Zeolite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
9.GD.05Gmelinite-Ca
(Ca,Na
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.05Gmelinite-K
(K
 
2
,Na
 
2
,Ca)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.05Gmelinite-Na
(Na
 
2
,Ca)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.10Willhendersonite
KCa[Al
 
3
Si
 
3
O
 
12
] · 5H
 
2
O
9.GD.10Chabazite-Ca
(Ca,K
 
2
,Na
 
2
)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
 · 12H
 
2
O
9.GD.10Chabazite-K
(K
 
2
,Ca,Na
 
2
,Sr,Mg)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
 · 12H
 
2
O
9.GD.10Chabazite-Na
(Na
 
2
,K
 
2
,Ca,Sr,Mg)
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
 · 12H
 
2
O
9.GD.10Chabazite-Sr
Sr
 
2
[Al
 
2
Si
 
4
O
 
12
]
 
2
 · 12H
 
2
O
9.GD.15Lévyne-Ca
(Ca,Na
 
2
,K
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.15Lévyne-Na
(Na
 
2
,Ca,K
 
2
)[Al
 
2
Si
 
4
O
 
12
] · 6H
 
2
O
9.GD.20Bellbergite
(K,Ba,Sr)
 
2
Sr
 
2
Ca
 
2
(Ca,Na)
 
4
[Al
 
3
Si
 
3
O
 
12
]
 
6
 · 30H
 
2
O
9.GD.20Erionite-Ca
(Ca,K
 
2
,Na
 
2
)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
9.GD.20Erionite-K
(K
 
2
,Ca,Na
 
2
)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
9.GD.20Erionite-Na
(Na
 
2
,K
 
2
,Ca)
 
2
[Al
 
4
Si
 
14
O
 
36
] · 15H
 
2
O
9.GD.25Offretite
KCaMgAl
 
5
Si
 
13
O
 
36
·16H
 
2
O or near
9.GD.25Wenkite
(Ba,K)
 
4
(Ca,Na)
 
6
[(SO
 
4
)
 
3
|(Si,Al)
 
20
O
 
39
(OH)
 
2
] · 0.5H
 
2
O
9.GD.30Faujasite-Ca
(Ca,Na
 
2
,Mg)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
9.GD.30Faujasite-Mg
(Mg,Na
 
2
,Ca)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
9.GD.30Faujasite-Na
(Na
 
2
,Ca,Mg)
 
3.5
[Al
 
7
Si
 
17
O
 
48
] · 32H
 
2
O
9.GD.35Maricopaite
Pb
 
7
Ca
 
2
(Si,Al)
 
48
O
 
100
·32H
 
2
O
9.GD.35Mordenite
(Na
 
2
,Ca,K
 
2
)Al
 
2
Si
 
10
O
 
24
·7H
 
2
O
9.GD.40Dachiardite-Ca
(Ca,Na
 
2
,K
 
2
)
 
5
Al
 
10
Si
 
38
O
 
96
·25H
 
2
O
9.GD.45Epistilbite
CaAl
 
2
Si
 
6
O
 
16
·5H
 
2
O
9.GD.50Ferrierite-K
(K
 
2
,Na
 
2
,Mg,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
]·18H
 
2
O
9.GD.50Ferrierite-Mg
(Mg,Na
 
2
,K
 
2
,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
]·18H
 
2
O
9.GD.50Ferrierite-Na
(Na
 
2
,K
 
2
,Mg,Ca)
 
3-5
Mg[Al
 
5-7
Si
 
27.5-31
O
 
72
]·18H
 
2
O
9.GD.55Bikitaite
LiAlSi
 
2
O
 
6
·H
 
2
O

Other Names for Dachiardite-Na

Synonyms:
Na DachiarditeSodium DachiarditeSvetlozarite
Other Languages:
German:Na Dachiardit
Natriumdachiardit
Svetlozarit
Russian:Дакиардит-Na
Spanish:Sodiumdadhiardita
Svetlozarita

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-Na

Reference List:▪ D'Achiardi, G. (1906): Zeoliti del filone della Speranza presso S. Piero in Campo (Elba). Atti della Società Toscana di Scienze Naturali, 22, 150-165

▪ Alberti, A. (1975): Sodium-rich dachiardite from Alpe di Siusi, Italy. Contributions to Mineralogy and Petrology, 49, 63-66

▪ Vezzalini, G. & Alberti, A. (1975): Le zeoliti dell'Alpe di Siusi. Rendiconti della Società Italiana di Mineralogia e Petrologia, 31, 711-719

▪ Yoshimura, T. & Wakabayashi, S. (1977): Na-dachiardite and associated high-silica zeolites from Tsugawa, Northeast Japan. Science Reports of Niigata University, Series E: Geology and Mineralogy, 4, 49-65

▪ Bonardi, M. (1979): Composition of type dachiardite from Elba: a re-examination. Mineralogical Magazine, 43, 548-549

▪ Demartin, F. & Stolcis, T. (1979): Nuovo giacimento di dachiardite in Val di Fassa. Rivista Mineralogica Italiana, 1979, 93-95

▪ Nishido, H., Otsuka, R., K. Nagashima, K. (1979): Sodium-rich dachiardite from Chichijima, the Ogasawara Islands, Japan. Waseda Daigaku Rikogaku Kenkyusho Hokoku, 87, 29-37

▪ Nishido, H. & Otsuka, R. (1981): Chemical composition and physical properties of dachiardite group zeolites. Mineralogical Journal, 10, 371-384

▪ Bonardi, M., Roberts, A.C., Sabina, A.P., Chao, G.Y. (1981): Sodium-rich dachiardite from the Francon Quarry, Montreal Island, Quebec. Canadian Mineralogist, 19, 285-289

▪ Gellens, L.R., Price, G.D., Smith, J.V. (1982): The structural relation between svetlozarite and dachiardite. Mineralogical Magazine, 45, 157-161

▪ Sanders, J.V. (1985): Crystallographic faulting in the mordenite group zeolites. Zeolites, 5, 81-90

▪ Bargar, K.E., Erd, R.C., Keith, T.E.C., Beeson, M.H. (1987): Dachiardite from Yellowstone National Park, Wyoming. Canadian Mineralogist, 25, 475-483

▪ Coombs, D.S., Alberti, A., Armbruster, T., Artioli, G., Colella, C., Galli, E., Grice, J.D., Liebau, F., Mandarino, J.A., Minato, H., Nickel, E.H., Passaglia, E., Peacor, D.R., Quartieri, S., Rinaldi, R., Ross, M., Sheppard, R.A., Tillmanns, E., Vezzalini, G. (1997): Recommended nomenclature for zeolites minerals - Report of the Subcommittee on Zeolites of the International Mineralogical Association, Commission on New Minerals and Mineral Names. [Review]. Canadian Mineralogist, 35, 1571-1606

Internet Links for Dachiardite-Na

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    Localities for Dachiardite-Na

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