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Aminoffite

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About AminoffiteHide

03833520014946780009172.jpg
Gregori Aminoff
Formula:
Ca2(Be,Al)(Si2O7)(H2O,OH)
Colour:
Colorless to light yellowish.
Lustre:
Vitreous
Hardness:
5½ - 6
Crystal System:
Tetragonal
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 AminoffiteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.BH.05

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

57 : SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
1 : Insular Si3O10 and Larger Noncyclic Groups with [Si3O10] groups
16.6.4

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

Physical Properties of AminoffiteHide

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

Optical Data of AminoffiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.647 nε = 1.637
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of AminoffiteHide

Formula:
Ca2(Be,Al)(Si2O7)(H2O,OH)
IMA Formula:
Ca3(BeOH)2Si3O10
Common Impurities:
Fe,Mn

Crystallography of AminoffiteHide

Crystal System:
Tetragonal
Cell Parameters:
a = 9.8 Å, c = 9.91 Å
Ratio:
a:c = 1 : 1.011
Unit Cell V:
951.76 ų (Calculated from Unit Cell)
Morphology:
As small, euhedral, pyramidal crystals, to 1 mm. Forms: simple tetragonal bipyramids {l11} truncated by the basal {001} face.
Twinning:
Commonly twinned, polysynthetically on {001}.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005773AminoffiteHuminicki D M C, Hawthorne F C (2002) Refinement of the crystal structure of aminoffite The Canadian Mineralogist 40 915-92220020293
CIF Raw Data - click here to close

Geological EnvironmentHide

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).

Type Occurrence of AminoffiteHide

General Appearance of Type Material:
Well-formed crystals in veins and cavities in massive magnetite and limonite
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.
Associated Minerals at Type Locality:

Other Language Names for AminoffiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Aminoffite associated with CalciteCaCO3

Related Minerals - Nickel-Strunz GroupingHide

9.BH.10KinoiteCa2Cu2(H2O)2[Si3O10]Mon. 2/m : P21/m
9.BH.15AkatoreiteMn2+9Al2Si8O24(OH)8Tric.
9.BH.20FencooperiteBa6Fe3+3Si8O23(CO3)2Cl3 · H2OTrig. 3m : P3m1

Related Minerals - Dana Grouping (8th Ed.)Hide

57.1.1.2HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24Orth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.6.1BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
16.6.2EuclaseBeAl(SiO4)(OH)Mon. 2/m : P21/b
16.6.3BaveniteCa4Be2Al2Si9O26(OH)2Orth. mm2
16.6.5MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
16.6.6LovdariteK2Na6Be4Si14O36 · 9H2OOrth. mm2
16.6.7Surinamite(Mg,Fe)3Al4BeSi3O16Mon.
16.6.8Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8Trig.

Fluorescence of AminoffiteHide

Strong organge color.

Other InformationHide

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 AminoffiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hurlbut, C.S. (1937) Aminoffite, a new mineral from Långban. Geologiska Föreningens i Stockholm Förhandlingar: 59: 290-292.
Foshag, W.F. (1938) New mineral names. American Mineralogist: 23: 293-294.
Coda, A., Rossi, G., Ungaretti, L. (1967) The crystal structure of aminoffite. Atti Rend. Accad. Lincei: 43(3-4): 225-232.
Welin, E. (1968) Notes on the mineralogy of Sweden 6. X-ray powder data for minerals from Långban and the related mineral deposits of Central Sweden. Arkiv för Mineralogi och Geologi: 4(30): 499-541.
Huminicki, D.M.C., Hawthorne, F.C. (2002) Refinement of the crystal structure of aminoffite. The Canadian Mineralogist: 40: 915-922.

Internet Links for AminoffiteHide

Localities for AminoffiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • New South Wales
    • Gough Co.
      • Emmaville
Handbook of Mineralogy
Russia
 
  • Tuva
Handbook of Mineralogy
Kapustin (1973) Doklady of the Academy of Sciences Chukanov, N.V. (2014) Infrared Spectra of Mineral Species: Extended Library. Springer-Verlag GmbH, Dordrecht
Sweden (TL)
 
  • Värmland County
    • Filipstad
      • Långban Ore District
Hurlbut, C. S. (1937): Aminoffite, a new mineral from Långban, Geologiska Föreningens i Stockholm Förhandlingar. 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.
 
Mineral and/or Locality  
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