Aminoffite
A valid IMA mineral species - grandfathered
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About Aminoffite
Formula:
Ca2(Be,Al)(Si2O7)(H2O,OH)
Colour:
Colorless to light yellowish.
Lustre:
Vitreous
Hardness:
5½ - 6
Specific Gravity:
2.94
Crystal System:
Tetragonal
Name:
To honor Dr. Gregori Aminoff (1883-1947), Swedish mineralogist and expert on LĂ„ngban mineralogy, associated with the Swedish Museum of Natural History (Naturhistoriska Riksmuseet) Stockholm, Sweden.
This page provides mineralogical data about Aminoffite.
Unique Identifiers
Mindat ID:
200
Long-form identifier:
mindat:1:1:200:4
GUID
(UUID V4):
(UUID V4):
7c6964ec-fb5c-4292-aff1-34d2c0edb3a4
IMA Classification of Aminoffite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Ca3(BeOH)2Si3O10
Classification of Aminoffite
9.BH.05
9 : SILICATES (Germanates)
B : Sorosilicates
H : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in tetrahedral [4] and greater coordination
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
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
16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Amf | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Aminoffite
Vitreous
Transparency:
Transparent
Colour:
Colorless to light yellowish.
Hardness:
5½ - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Poor on {001}
Poor on {001}
Fracture:
Conchoidal
Density:
2.94 g/cm3 (Measured) 2.86 g/cm3 (Calculated)
Optical Data of Aminoffite
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.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Comments:
may be abnormally biaxial.
Chemistry of Aminoffite
Mindat Formula:
Ca2(Be,Al)(Si2O7)(H2O,OH)
Common Impurities:
Fe,Mn
Crystallography of Aminoffite
Crystal System:
Tetragonal
Class (H-M):
4/m - Dipyramidal
Space Group:
P42/n
Cell Parameters:
a = 9.865(2) Å, c = 9.930(2) Å
Ratio:
a:c = 1 : 1.007
Unit Cell V:
966.37 Ă
Âł (Calculated from Unit Cell)
Z:
4
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 Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0005773 | Aminoffite | Huminicki D M C, Hawthorne F C (2002) Refinement of the crystal structure of aminoffite The Canadian Mineralogist 40 915-922 | 2002 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.614 Ă | (100) |
2.84 Ă | (90) |
4.02 Ă | (80) |
2.141 Ă | (80) |
6.97 Ă | (70) |
4.40 Ă | (70) |
3.48 Ă | (70) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
High-đ alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations | |
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
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 Aminoffite
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:
Reference:
Hurlbut, C.S. (1937) Aminoffite, a new mineral from LÄngban. Geologiska Föreningens i Stockholm Förhandlingar: 59: 290-292.
Other Language Names for Aminoffite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
9.BH. | Bunnoite | Mn2+6AlSi6O18(OH)3 |
9.BH.10 | Kinoite | Ca2Cu2(H2O)2[Si3O10] |
9.BH.15 | Akatoreite | Mn2+9Al2Si8O24(OH)8 |
9.BH.20 | Fencooperite | Ba6Fe3+3Si8O23(CO3)2Cl3 · H2O |
Fluorescence of Aminoffite
Strong organge color.
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.
Internet Links for Aminoffite
mindat.org URL:
https://www.mindat.org/min-200.html
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Please feel free to link to this page.
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References for Aminoffite
Reference List:
Hurlbut, Cornelius S. (1937) Aminoffite, a new mineral from LÄngban. Geologiska Föreningen i Stockholm Förhandlingar, 59 (3) 290-292 doi:10.1080/11035893709444957
Localities for Aminoffite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Australia | |
| Mineralogical Society of America - ... |
Russia | |
| Mineralogical Society of America - ... |
Kapustin (1973) +1 other reference | |
Sweden (TL) | |
| Hurlbut (1937) +1 other reference |
Thulin (2003) |
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LĂ„ngban Mine, LĂ„ngban Ore District, Filipstad, VĂ€rmland County, Sweden