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Amicite

Big Photo

Kirovskii apatite mine (Kirovsky Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Volker Betz

Show Amicite Photos (4)
Formula:
K
 
2
Na
 
2
Al
 
4
Si
 
4
O
 
16
·5H
 
2
O
System:MonoclinicColour:Colorless
Hardness:4½
Name:
Named in 1979 for Giovan Battista Amici (1786-1863) physicist, optician and inventor of the amici lens


Zeolite group.

Classification of Amicite

IMA status:Approved
Strunz 8th edition ID:8/J.25-10
Nickel-Strunz 10th (pending) edition ID:9.GC.05

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
C : Chains of doubly-connected 4-membered rings
Dana 8th edition ID:77.1.3.2

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

Type Locality:Höwenegg (Hewenegg) quarry, Immendingen, Hegau, Baden-Württemberg, Germany
Place of Conservation of Type Material:Smithsonian 145843
Year of Discovery:1979

Occurrences of Amicite

Geological Setting:Nepheline bearing rocks.

Physical Properties of Amicite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colorless
Streak:White
Hardness (Mohs):4½
Cleavage:None Observed
Fracture:Conchoidal
Density (measured):2.06 - 2.23 g/cm3
Density (calculated):2.16 g/cm3

Crystallography of Amicite

Crystal System:Monoclinic
Class (H-M):2 - Sphenoidal
Cell Parameters:a = 10.22Å, b = 10.42Å, c = 9.88Å
β = 88.32°
Ratio:a:b:c = 0.981 : 1 : 0.948
Unit Cell Volume:V 1,051.69 ų (Calculated from Unit Cell)
Z:2
Morphology:Pseudotetragonal pyramidal crystals to 5mm

Optical Data of Amicite

Type:Biaxial (-)
RI values: nα = 1.485 nβ = 1.490 nγ = 1.494
2V:Measured: 82°
Maximum Birefringence:δ = 0.009

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

Chemical Properties of Amicite

Formula:
K
 
2
Na
 
2
Al
 
4
Si
 
4
O
 
16
·5H
 
2
O
Essential elements:Al, H, K, Na, O, Si
All elements listed in formula:Al, H, K, Na, O, Si
Common Impurities:Fe,Mg,Ca,Sr,Ba

Relationship of Amicite to other Species

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

- +
9.GC.05Garronite
Na
 
2
Ca
 
5
Al
 
12
Si
 
20
O
 
64
·27H
 
2
O
9.GC.05Gismondine-Ca
CaAl
 
2
Si
 
2
O
 
8
·4H
 
2
O
9.GC.05Gobbinsite
Na
 
4
(Ca,Mg,K
 
2
)Al
 
6
Si
 
10
O
 
32
·12H
 
2
O
9.GC.05Gismondine
Ca[Al
 
2
Si
 
2
O
 
8
]·4.5H
 
2
O
9.GC.10Harmotome
(Ba
 
0.5
,Ca
 
0.5
,K,Na)
 
5
[Al
 
5
Si
 
11
O
 
32
] ·12H
 
2
O
9.GC.10Phillipsite-Ca
(Ca
 
0.5
,K,Na,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
.
 
 12H2O
9.GC.10Phillipsite-K
(K,Na,Ca
 
0.5
,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
]
.
 
 12H
 
2
O
9.GC.10Phillipsite-Na
(Na,K,Ca
 
0.5
,Ba
 
0.5
)
 
4-7
[Al
 
4-7
Si
 
12-9
O
 
32
] · 12H
 
2
O
9.GC.10Flörkeite
(K
 
3
Ca
 
2
Na)[Al
 
8
Si
 
8
O
 
32
]·12H
 
2
O
9.GC.15Merlinoite
(K,Na)
 
5
(Ca,Ba)
 
2
Al
 
9
Si
 
23
O
 
64
·23H
 
2
O
9.GC.20Mazzite-Mg
K
 
2
Mg
 
2
Ca
 
1.5
Al
 
9.5
Si
 
26.5
O
 
72
·28H
 
2
O or near
9.GC.20Mazzite-Na
Na
 
4
[Al
 
4
Si
 
14
O
 
36
]
 
2
 · 30H
 
2
O
9.GC.25Perlialite
K
 
9
Na(Ca,Sr)[Al
 
2
Si
 
4
O
 
12
]
 
6
 · 15H
 
2
O
9.GC.30Boggsite
Ca
 
8
Na
 
3
(Si,Al)
 
96
O
 
192
·70H
 
2
O
9.GC.35Paulingite-Ca
(Ca,K
 
2
,Na
 
2
,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O
9.GC.35Paulingite-K
(K
 
2
,Ca,Na
 
2
,Ba)
 
5
[Al
 
10
Si
 
35
O
 
90
] · 45H
 
2
O

Other Names for Amicite

Synonyms:
Amicchite
Other Languages:
German:Amicchit
Amicit
Russian:Амичит
Spanish:Amicchita
Amicita

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 Amicite

Reference List:Acta Crystallographica: B35: 2866-2869.

Internet Links for Amicite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Amicite details from Handbook of Mineralogy (PDF)
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    Localities for Amicite

    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.
    Germany
     
    • Baden-Württemberg
      • Hegau
        • Immendingen
    		Tschernich, R. (1992), Zeolites of the World, p.42
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		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
    Mineral and/or Locality
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