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Aminoffite

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Big Photo

Långban, Filipstad, Värmland, Sweden
© M. Burkhardt

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Formula:
Ca
 
2
(Be,Al)(Si
 
2
O
 
7
)(H
 
2
O,OH)
System:TetragonalColour:Colorless to light ...
Hardness:5½ - 6
Name:
To honor Dr. Gregori Aminoff (1883-1947), Swedish mineralogist and expert on Långban mineralogy, associated with the Swedish Museum of Natural History (Naturhistoriska Riksmuseet) Stockholm, Sweden.
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
Place of Conservation of Type Material:Harvard University, Cambridge, Massachusetts, 94627, 106916, 106917; National Museum of Natural History, Washington, D.C., USA, 137291, R7823; The Natural History Museum, London, England, 1984,423.
Year of Discovery:1937
Geological Setting of type material:In cavities in massive magnetite
Associated Minerals at type locality:
MagnetiteGoethite

Occurrences of Aminoffite

Geological Setting:in fluorite veins at the contact between marbles and hornblende granites associated with hastingsite nepheline syenites (Dugdinsk massif, Russia); in fluorite veins in tinguaite and nephelinite dikes (Bayankolsk dike field, Russia).

Physical Properties of Aminoffite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colorless to light yellowish.
Hardness (Mohs):5½ - 6
Tenacity:Brittle
Cleavage:Poor/Indistinct
Poor on {001}
Fracture:Conchoidal

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)
Morphology:As small, euhedral, pyramidal crystals, to 1 mm.
Twinning:Commonly twinned, polysynthetically on {001}.

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
)(H
 
2
O,OH)
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

Common Associates:
Fluorite
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
(HSi
 
4
O
 
13
)
 
2
(OH)
 
6
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(SiO
 
4
)(OH)
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

Other Languages:
German:Aminoffit
Russian:Аминовит
Spanish: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
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    • Localities for Aminoffite

    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.
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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.
    Russia
     
    • Eastern-Siberian Region
      • Tuva Republic
    		Tony Nikischer
    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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