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Antonio D'Achiardi
4 - 4½
Named after Antonio D'Achiardi (November 28, 1839, Pisa – December 10, 1902, Pisa), Professor of Mineralogy, Universitá di Pisa, Italy, who first described the mineral discovered by his son in a granitic pegmatite.
Zeolite Group.
Name for unspecified member within the series between dachiardite-Ca and dachiardite-Na.

Classification of Dachiardite

1 : Zeolite group - True zeolites

16 : Silicates Containing Aluminum and other Metals
10 : Aluminosilicates of Ca and alkalis

Physical Properties of Dachiardite

Hardness (Mohs):
4 - 4½

Optical Data of Dachiardite

Biaxial (+)
RI values:
nα = 1.488 - 1.494 nβ = 1.490 - 1.496 nγ = 1.494 - 1.499
Measured: 58° to 73°, Calculated: 72° to 80°
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r > v strong

Crystallography of Dachiardite

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

Relationship of Dachiardite to other Species

16.10.4Thomsonite-CaNaCa2(Al5Si5)O20 · 6H2O
16.10.5Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
16.10.6MesoliteNa2Ca2(Si9Al6)O30 · 8H2O
16.10.8Garronite-CaNaCa2.5(Si10Al6)O32 · 14H2O
16.10.9BoggsiteNa3Ca8(Si77Al19)O192 · 70H2O
16.10.10Herschelite(Na2,K2,Ca,Sr,Mg)2[Al2Si4O12]2 · 12H2O
16.10.12Fedorite(K,Na)2.5(Ca,Na)7Si16O38(OH,F)2 · 3.5H2O
16.10.13WillhendersoniteKCa(Si3Al3)O12 · 5H2O
16.10.14BarreriteNa2(Al2Si7)O18 · 6H2O
16.10.15Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
16.10.16ReyeriteNa2Ca14Al2Si22O58(OH)8 · 6H2O
16.10.20GobbinsiteNa5(Si11Al5)O32 · 11H2O
16.10.23OffretiteKCaMg(Si13Al5)O36 · 15H2O
16.10.24PerlialiteK9NaCa(Si24Al12)O72 · 15H2O
16.10.27Sodium Dachiardite(Na2,Ca,K2)4-5Al8Si40O96 · 26H2O
16.10.28Mazzite-MgMg5(Si26Al10)O72 · 30H2O
16.10.29RoggianiteCa2BeAl2Si4O13(OH)2 · nH2O (n < 2.5)

Other Names for Dachiardite

Name in Other Languages:

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.

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 URL:
Please feel free to link to this page.

Localities for Dachiardite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
  • Carinthia
    • Klagenfurt
      • Gundersdorf
[Dachiardite-Na] G. Niedermayr: Carinthia II 187./107.:172 (1997)
  • Styria
    • Bruck an der Mur
      • Kapfenberg
        • Tanzenberg
[Dachiardite-Na] ostl, W. & Walter, F. (1983); Postl, W. et al. (1985); Exel, R. (1993)
    • Graz
      • Wildon
        • Weitendorf
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
  • Kardzhali Oblast (Kurdzhali; Kărdžali; Kurdjali)
    • Momchilgrad Obshtina
Encheva, S., Petrov, P., Chukanov, N., Pekov, I., Енчева, С., Петко, П., ... & Пеков, И. Dachiardite-K from the area of Austa village, Momchilgrad municipality, Eastern Rhodopes–a new mineral species of zeolite group Дакиардит-K от района на с. Ауста, община Момчилград, Източни Родопи–нов минерален вид от групата на зеолитите.
    • Rhodope Mts
[Dachiardite-Ca] Gellens, L., Price, G. D., & Smith, J. V. (1982). The structural relation between svetlozarite and dachiardite. Mineralogical Magazine, 45(337), 157-161.
  • Québec
    • Montréal
[Dachiardite-Na] BONARDI, M., ROBERTS, A.C., and SABINA, A.P. (1981) Sodium-rich dachiardite from the Francon quarry, Montreal Island, Quebec. Canadian Mineralogist, 19, 285-289. TARASSOFF, P., HORVÁTH, L. and PFENNINGER-HORVÁTH, E. (2006) Famous mineral localities: the Francon quarry, Montréal, Québec. The Mineralogical Record, 37, 5-60.
Czech Republic
  • Bohemia (Böhmen; Boehmen)
    • Liberec Region
      • Proseč pod Ještědem
[Dachiardite-Ca] Pauliš P. et al.: Dachiardit-Ca z Proseče pod Ještědem u Liberce. Zprávy o geologických výzkumech v roce 2007, Mineralogie, petrologie a geochemie, 179-181.
    • Pardubice Region
      • Svitavy (Zwittau)
[Dachiardite-Ca] Rychlý, R., Veselovský, F., Ondruš, P.: Dachiardite from Svojanov, Czech Republic. Scripta Fac. Sci. Nat. Univ. Masaryk. Brun, Geol., 1996, vol. 26, p. 42 - 43.
    • Ústí Region
      • Děčín (Tetschen)
        • Krásná Lípa
[Dachiardite-Ca] P.Pauliš,L.Hrůzek,O.Janeček,J.Sejkora,R.Malíková,F.Fedyuk(2014)Dachiardite-Ca and associated mineralization from Doubice-Vápenka near Krásná Lípa(Czech Republic).Bull.Min.-Pet.od.Národní muzeum Praha 22,1
French Southern and Antarctic Lands
  • Kerguelen Islands
Giret, A., Verdier, O. & Nativel, P. (1992). The zeolitisation of Kerguelen Islands, Southern Indian Ocean. In: Yoshida, Y., et al. (eds) Recent Progress in Antarctic Earth Science, Tokyo: Terra Publishing 32, 1–36. Co., pp. 457–463.
  • Bavaria
    • Franconia
      • Maroldsweisach
[Dachiardite-Na] Wittern: "Mineralfundorte in Deutschland", 2001
  • Hesse
    • Vogelsberg
      • Ortenberg
  • Borsod-Abaúj-Zemplén Co.
    • Zemplén Mts (Tokaj Mts)
      • Regéc
Szakáll & Jánosi: Minerals of Hungary, 1995
  • Heves Co.
Van King
  • Pest Co.
    • Börzsöny Mts
      • Szob
[Dachiardite-Ca] Szakáll-Gatter-Szendrei: Mineral species of Hungary 2005
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Bolzano Province (South Tyrol)
      • Gardena Valley (Gröden Valley)
        • Siusi Alp (Seis Alp)
[Dachiardite-Na] Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
    • Trento Province
      • Fassa Valley
        • Canazei
[Dachiardite-Na] Pedroni G. (1996): Note di mineralogia del Passo Fedaia (gruppo della Marmolada). Riv. Mineral. Ital., 20, 2 (2-1996), 189-192.
[Dachiardite-Na] Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
        • Duron Valley
[Dachiardite-Na] Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
[Dachiardite-Na] Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
[Dachiardite-Na] Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
[Dachiardite-Na] Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
[Dachiardite-Na] Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
[Dachiardite-Na] Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
  • Tuscany
    • Livorno Province
      • Elba Island
        • Campo nell'Elba
[Dachiardite-Ca] G. D'Achiardi (1905) - Zeolite probabilmente nuova dell'isola d'Elba - Atti Soc. Tosc. Sc. Nat., P.V., 14: 150-156.
[Dachiardite-Ca] Orlandi, P., & Pezzotta, F. (1997). Minerali dell'Isola d'Elba. Edizioni Novecento Grafico, Bergamo, 249 pp.
[Dachiardite-Ca] Orlandi, P., & Pezzotta, F. (1997). Minerali dell'Isola d'Elba. Edizioni Novecento Grafico, Bergamo, 249 pp. ; 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.
  • Honshu Island
    • Chubu region
      • Nagano Prefecture
        • Nagano City
          • Matsushiro
            • Toyosaka
[Dachiardite-Ca] Eur. J. Mineral. , 1990, 2, pp. 187-193.
      • Niigata Prefecture
        • Aga-machi (Higashi-Kanbara-gun)
          • Tsugawa
[Dachiardite-Na] Yoshimura, T. & Wakabayashi, S. (1977): Na-dachiardite and associated high-silica zeolites from Tsugawa, northeast Japan. Science Reports of Niigata University, Ser. E, Geology and Mineralogy, 4, 49-65.
      • Shizuoka Prefecture
        • Kawazu
Yamada, T. et al (1994) Suisyou, 8, #1, 12-16.
  • Kyushu Region
    • Kagoshima Prefecture
[Dachiardite-Ca] Eur. J. Mineral. , 1990, 2, pp. 187-193.
  • Tokyo Metropolis
    • 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
  • Irbid
Khoury, H. N., Salameh, E., & Abdul-Jaber, Q. (1985). Characteristics of an unusual highly alkaline water from the Maqarin area, northern Jordan. Journal of Hydrology, 81(1), 79-91.
New Zealand
  • South Island
    • Canterbury
Jesse Crawford specimen
  • Crimea Oblast'
[Dachiardite-Na] World of Stones v.9
[Dachiardite-Na] Tischenko A. data
  • California
    • Los Angeles Co.
Mineral News v.14 no.9
        • Agoura Hills
Houseley, Bob (2013)
Housley, R. (2016) personal communication to Marek Chorazewicz Collected by Chorazewicz, M. (2016)
DeVito, A. N. (1997), Minerals of the Canwood construction site, Agoura Hills, California. Micro Probe: 8(5): 2-10.
    • Riverside Co.
      • Mule Mts
        • Wiley Well District
  • Oregon
    • Deschutes Co.
      • East Lake
Mineralogy of 10 Geothermal boreholes drilled in and around the Newberry Caldera U.S. Geological Survey Professional Paper, Issue 1578 By Keith E. Bargar, Terry E. C. Keith 1999
    • Lincoln Co.
      • Agate Beach
[Dachiardite-Na] Micro Probe Vol. 9 No 3, spring 2001; Tschernich, R. (1992): Zeolites of the World, 116
    • Tillamook Co.
[Dachiardite-Ca] Micro Probe Volume IX Number 3
  • Washington
    • Wahkiakum Co.
      • Altoona
[Dachiardite-Ca] Micro Probe Volume IX Number 3 Spring 2001
  • Wyoming
    • Park Co.
[Dachiardite-Na] Bargar, K.E.; Beeson, M.H. & Keith, T.E.C. (1981): Zeolites in Yellowstone National Park. Mineralogical Record 12, 29-38
[Dachiardite-Na] Bargar, K.E.; Beeson, M.H. & Keith, T.E.C. (1981): Zeolites in Yellowstone National Park. Mineralogical Record 12, 29-38
[Dachiardite-Na] Tschernich, 1992. Zeolites of the World
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