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Giovanni Battista Amici
K2Na2Al4Si4O16 · 5H2O
Member of:
Named in 1979 for Giovanni Battista Amici (1786-1863), physicist, optician and inventor of the Amici lens.

Classification of Amicite


9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
C : Chains of doubly-connected 4-membered rings

1 : Zeolite group - True zeolites

Occurrences of Amicite

Type Occurrence of Amicite

Place of Conservation of Type Material:
University of Modena, Modena, Italy; The Natural History Museum, London, England; National Museum of Natural History, Washington, D.C., USA, 145843.
Geological Setting of Type Material:
In veinlets cutting melilite-nephelinite volcanic rocks and pyroclastics
Associated Minerals at Type Locality:

Physical Properties of Amicite

Diaphaneity (Transparency):
Hardness (Mohs):
None Observed
2.06 - 2.23 g/cm3 (Measured)    2.16 g/cm3 (Calculated)

Crystallography of Amicite

Crystal System:
Class (H-M):
2 - Sphenoidal
Cell Parameters:
a = 10.22Å, b = 10.42Å, c = 9.88Å
β = 88.32°
a:b:c = 0.981 : 1 : 0.948
Unit Cell Volume:
V 1,051.69 ų (Calculated from Unit Cell)
As well-formed pseudotetragonal pyramidal crystals, to 5 mm, showing {011} and {110}, or more rarely {111} and {110}.

Optical Data of Amicite

Biaxial (-)
RI values:
nα = 1.485 nβ = 1.490 nγ = 1.494
Measured: 82°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
very weak

Chemical Properties of Amicite

K2Na2Al4Si4O16 · 5H2O
All elements listed in formula:
Common Impurities:

Relationship of Amicite to other Species

Member of:
Other Members of Group:
AlflarseniteNaCa2Be3Si4O13(OH) · 2H2O
AnalcimeNa(AlSi2O6) · H2O
Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4[Al3Si3O12]6 · 30H2O
BikitaiteLiAlSi2O6 · H2O
BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
Brewsterite-Ba(Ba,Sr)[Al2Si6O16] · 5H2O
Brewsterite-Sr(Sr,Ba,Ca)[Al2Si6O16] · 5H2O
Chabazite-Levyne SubgroupA subgroup of the Zeolite Group.
ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2O
CowlesiteCaAl2Si3O10 · 6H2O
Dachiardite-Ca(Ca,Na2,K2)5Al10Si38O96 · 25H2O
Dachiardite-Na(Na2,Ca,K2)5Al10Si38O96 · 25H2O
DirenzoiteNaK6MgCa2(Al13Si47O120) · 36H2O
EdingtoniteBa[Al2Si3O10] · 4H2O
EpistilbiteCaAl2Si6O16 · 5H2O
Erionite-Ca(Ca,K2,Na2)2[Al4Si14O36] · 15H2O
Erionite-K(K2,Ca,Na2)2[Al4Si14O36] · 15H2O
Erionite-Na(Na2,K2,Ca)2[Al4Si14O36] · 15H2O
Faujasite-Ca(Ca,Na2,Mg)3.5[Al7Si17O48] · 32H2O
Faujasite-Mg(Mg,Na2,Ca)3.5[Al7Si17O48] · 32H2O
Faujasite-Na(Na2,Ca,Mg)3.5[Al7Si17O48] · 32H2O
Ferrierite-K(K2,Na2,Mg,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
Ferrierite-Mg(Mg,Na2,K2,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
Ferrierite-Na(Na2,K2,Mg,Ca)3-5Mg[Al5-7Si27.5-31O72] · 18H2O
FerrochiavenniteCa1-2Fe[(Si,Al,Be)5Be2O13(OH)2] · 2H2O
Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2O
Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
GaultiteNa4Zn2Si7O18 · 5H2O
Gismondine-BaBa2Al4Si4O16 · 4-6H2O
Gismondine-CaCaAl2Si2O8 · 4H2O
Gmelinite-CaCa2(Si8Al4O24] · 11H2O
Gmelinite-KK4(Si8Al4O24) · 11H2O
Gmelinite-NaNa4(Si8Al4O24] · 11H2O
GobbinsiteNa5(Si11Al5)O32 · 11H2O
Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
GoosecreekiteCa[Al2Si6O16] · 5H2O
GottardiiteNa3Mg3Ca5Al19Si117O272 · 93H2O
Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
Heulandite-Ba(Ba,Ca,K)5(Si27Al9)O72 · 22H2O
Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Heulandite-K(K,Ca,Na)5(Si27Al9)O72 · 26H2O
Heulandite-Na(Na,Ca,K)6(Si,Al)36O72 · 22H2O
Heulandite-Sr(Sr,Na,Ca)5(Si27Al9)O72 · 24H2O
LaumontiteCaAl2Si4O12 · 4H2O
LovdariteK2Na6Be4Si14O36 · 9H2O
MaricopaitePb7Ca2(Si,Al)48O100 · 32H2O
Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
Mazzite-NaNa8[Al4Si14O36]2 · 30H2O
Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O
MesoliteNa2Ca2Si9Al6O30 · 8H2O
Montesommaite(K,Na)9Al9Si23O64 · 10H2O
Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
MutinaiteNa3Ca4Si85Al11O192 · 60H2O
NabesiteNa2BeSi4O10 · 4H2O
NatroliteNa2Al2Si3O10 · 2H2O
Natrolite SubgroupA subgroup of the Zeolite Group.
OffretiteKCaMg(Si13Al5)O36 · 15H2O
PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
ParanatroliteNa2Al2Si3O10 · 3H2O
ParthéiteCa2(Si4Al4) O15 (OH)2•4H2O
Paulingite-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2O
Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O
Paulingite-Na(Na2,K2,Ca,Ba)5[Al10Si35O90] · 45H2O
PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
Phillipsite-Ca(Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32 . 12H2O
Phillipsite-K(K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O
Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
Pollucite(Cs,Na)2(Al2Si4O12) · 2H2O
RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O
ScoleciteCaAl2Si3O10 · 3H2O
StelleriteCa4(Si28Al8)O72 · 28H2O
Stilbite-CaNaCa4[Al9Si27O72] · nH2O
Stilbite-Na(Na,Ca,K)6-7[Al8Si28O72] · nH2O
Terranovaite(Na,Ca)8(Si68Al12)O160 · 29H2O
Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Thomsonite-SrNa(Sr,Ca)2[Al5Si5O20] · 7H2O
Tschernichite(Ca,Na2)[Al2Si4O12] · 4-8H2O
TschörtneriteCa4(Ca,Sr,K,Ba)3Cu3[(OH)2|Al3Si3O12]4 · nH2O
WairakiteCa(Al2Si4O12) · 2H2O
WeinebeneiteCaBe3(PO4)2(OH)2 · 4H2O
Wenkite(Ba,K)4(Ca,Na)6[(SO4)3|(Si,Al)20O39(OH)2] · 0.5H2O
WillhendersoniteKCa[Al3Si3O12] · 5H2O
YugawaraliteCaAl2Si6O16 · 4H2O
Common Associates:
9.GC.05Garronite-CaNa2Ca5Al12Si20O64 · 27H2O
9.GC.05Gismondine-CaCaAl2Si2O8 · 4H2O
9.GC.05GobbinsiteNa5(Si11Al5)O32 · 11H2O
9.GC.10Harmotome(Ba0.5,Ca0.5,K,Na)5[Al5Si11O32] · 12H2O
9.GC.10Phillipsite-Ca(Ca0.5,K,Na,Ba0.5)4-7[Al4-7Si12-9O32 . 12H2O
9.GC.10Phillipsite-K(K,Na,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] . 12H2O
9.GC.10Phillipsite-Na(Na,K,Ca0.5,Ba0.5)4-7[Al4-7Si12-9O32] · 12H2O
9.GC.10Flörkeite(K3Ca2Na)[Al8Si8O32] · 12H2O
9.GC.15Merlinoite(K,Na)5(Ca,Ba)2Al9Si23O64 · 23H2O
9.GC.20Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
9.GC.20Mazzite-NaNa8[Al4Si14O36]2 · 30H2O
9.GC.25PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
9.GC.30BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
9.GC.35Paulingite-Ca(Ca,K,Na,Ba,◻)10 (Si, Al)42O84•34H2O
9.GC.35Paulingite-K(K2,Ca,Na2,Ba)5[Al10Si35O90] · 45H2O

Other Names for Amicite

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 Amicite

Reference List:
Alberti, A., Hentschel, G., Vezzalini, G. (1979) Amicite, a new natural zeolite. Neues Jahrbuch für Mineralogie, Monatshefte: 1979: 481-488.

Alberti, A., Vezzalini, G. (1979) The crystal structure of amicite, a zeolite. Acta Crystallographica: B35: 2866-2869.

Fleischer, M., Cabri, L.J., Chao, G.Y., Pabst, A. (1980) New mineral names. American Mineralogist: 65: 808-814.

Internet Links for Amicite URL:
Please feel free to link to this page.

Localities for Amicite

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.
Germany (TL)
  • Baden-Württemberg
    • Hegau
      • Immendingen
Tschernich, R. (1992), Zeolites of the World, p.42
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
          • Koashva Mt
Pekov, I.V., Chukanov, N.V., Kononkova, N.N., Zubkova, N.V., Rabadanov, M.K., and Pushcharovsky, D.Y. (2008): Geology of Ore Deposits 50(8), 749-754.
          • Kukisvumchorr Mt
World of Stones 95:5-6, p64; Tschernich R. (1992), Zeolites of the World, p.42
  • Castile-La Mancha
    • Ciudad Real
      • Campo de Calatrava volcanoes
Calvo, M., Viñals, J., Sanz, A. and Martí, J. (2013). Zeolites and asociated minerals in the vacuoles of some of the Campo de calatrava volcanoes - Ciudad Real, Spain. Mineral Up,3, 54-69
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