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Aminoffite

Big Photo

Långban, Filipstad, Värmland, Sweden
© Knut Eldjarn

Formula:
Ca
 
2
(Be,Al)Si
 
2
O
 
7
(OH)·H
 
2
O
System:TetragonalHardness:5½
This page provides mineralogical data about Aminoffite.

Classification of Aminoffite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/C.29-10
Nickel-Strunz 10th (pending) edition ID:9.BH.05

9 : SILICATES (Germanates)
B : Sorosilicates
H : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in tetrahedral [4] and greater coordination
Dana 8th edition ID:57.1.1.1

57 : SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
1 : Insular Si3O10 and Larger Noncyclic Groups with [Si3O10] groups
Hey's CIM Ref.:16.6.4

16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be
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Type Occurrence of Aminoffite

Type Locality:Långban, Filipstad, Värmland, Sweden
Year of Discovery:1937

Physical Properties of Aminoffite

Hardness (Mohs):5½

Crystallography of Aminoffite

Crystal System:Tetragonal
Cell Parameters:a = 9.8Å, c = 9.91Å
Ratio:a:c = 1 : 1.011
Unit Cell Volume:V 951.76 ų (Calculated from Unit Cell)

Optical Data of Aminoffite

Type:Uniaxial (-)
RI values: nω = 1.647 nε = 1.637
Maximum Birefringence:δ = 0.010

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

Chemical Properties of Aminoffite

Formula:
Ca
 
2
(Be,Al)Si
 
2
O
 
7
(OH)·H
 
2
O
Essential elements:Be, Ca, H, O, Si
All elements listed in formula:Al, Be, Ca, H, O, Si
Common Impurities:Fe,Mn

Relationship of Aminoffite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.BH.10Kinoite
Ca
 
2
Cu
 
2
(H
 
2
O)
 
2
[Si
 
3
O
 
10
]
9.BH.15Akatoreite
(Mn
2+
 
,Fe
2+
 
)
 
9
Al
 
2
[(OH)
 
3
|HSi
 
4
O
 
13
]
9.BH.20Fencooperite
Ba
 
6
Fe
3+
3
Si
 
8
O
 
23
(CO
 
3
)
 
2
Cl
 
3
·H
 
2
O
Related Minerals - Hey's Index Grouping:
16.6.1Beryl
Be
 
3
Al
 
2
Si
 
6
O
 
18
16.6.2Euclase
BeAl[OH|SiO
 
4
]
16.6.3Bavenite
Ca
 
4
Be
 
2
Al
 
2
Si
 
9
O
 
26
(OH)
 
2
16.6.5Milarite
K
 
2
Ca
 
4
Al
 
2
Be
 
4
Si
 
24
O
 
60
·H
 
2
O
16.6.6Lovdarite
(Na,K,Ca)
 
4
(Be,Al)
 
2
Si
 
6
O
 
16
·4H
 
2
O
16.6.7Surinamite
(Mg,Fe)
 
3
Al
 
4
BeSi
 
3
O
 
16
16.6.8Ferrotaaffeite-6N'3S
(Be,Zn,Mg)FeAl
 
4
O
 
8

Other Names for Aminoffite

German names:
Aminoffit
Russian names:
Аминовит
Spanish names:
Aminoffita

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 Aminoffite

Reference List:American Mineralogist: 23: 293.

Internet Links for Aminoffite

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

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    (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.
    Sweden
     
    • Värmland
      • Filipstad
    		GFF (1937) 59, 290-292; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
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