Amstallite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Amstallite
Unique Identifiers
Mindat ID:
208
Long-form identifier:
mindat:1:1:208:6
GUID
(UUID V4):
(UUID V4):
09a1cfd9-809a-46d9-b8d4-e7c4d77e86d1
IMA Classification of Amstallite
Approved
First published:
1987
Classification of Amstallite
9.DP.25
9 : SILICATES (Germanates)
D : Inosilicates
P : Transitional ino-phyllosilicate structures
9 : SILICATES (Germanates)
D : Inosilicates
P : Transitional ino-phyllosilicate structures
72.1.4.1
72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
1 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
1 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
16.9.32
16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca
16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Ams | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Amstallite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless
Hardness:
3 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
good on {100}
good on {100}
Fracture:
Conchoidal
Density:
2.40(5) g/cm3 (Measured) 2.38 g/cm3 (Calculated)
Optical Data of Amstallite
Type:
Biaxial (+)
RI values:
nα = 1.533 nβ = 1.534 nγ = 1.538
2V:
Measured: 57° to 59°, Calculated: 54°
Max Birefringence:
δ = 0.005
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:
Low
Dispersion:
r > v weak
Chemistry of Amstallite
Mindat Formula:
CaAl[(Al,Si)4O8(OH)2](OH)2 · (H2O,Cl)
Crystallography of Amstallite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 18.83 Å, b = 11.51 Å, c = 5.19 Å
β = 100.86°
β = 100.86°
Ratio:
a:b:c = 1.636 : 1 : 0.451
Unit Cell V:
1,104.70 ų (Calculated from Unit Cell)
Z:
4
Morphology:
As acicular prismatic crystals, to 1 cm, elongated and commonly striated parallel to [001], with cross sections appearing rhombohedral or hexagonal.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
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) |
---|---|---|---|---|---|---|---|
0014815 | Amstallite | Quint R (1987) Description and crystal structure of amstallite, CaAl(OH)2[Al0.8Si3.2O8(OH)2]*[(H2O)0.8Cl0.2], a new mineral from Amstall, Austria Neues Jahrbuch fur Mineralogie, Monatshefte 1987 253-262 | 1987 | Amstall, Austria | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.75 Å | (100) |
5.43 Å | (70) |
4.714 Å | (60) |
4.069 Å | (40) |
3.816 Å | (90) |
3.603 Å | (100) |
3.175 Å | (60) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 5: Initiation of plate tectonics | <3.5-2.5 |
40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Amstallite
Place of Conservation of Type Material:
Institute of Mineralogy and Crystallography, Vienna University; Natural History Museum, Vienna, Austria (cat. no. M 455).
Geological Setting of Type Material:
In open fissures cutting pegmatitic schlieren, in hydrothermally altered graphite-bearing metamorphic rocks.
Associated Minerals at Type Locality:
Reference:
Quint, R. (1987) Description and crystal structure of amstallite, CaAl(OH)2[Al0.8Si3.2O8(OH)2]·[(H2O)0.8Cl0.2], a new mineral from Amstall, Austria. Neues Jahrbuch für Mineralogie, Monatshefte: 1987: 253-262.
Synonyms of Amstallite
Other Language Names for Amstallite
Common Associates
Related Minerals - Strunz-mindat Grouping
9.DP. | Ferriprehnite | Ca2Fe3+(Si3AlO10)(OH)2 |
9.DP.05 | Meliphanite | (Ca,Na)2(Be,Al)[Si2O6(OH,F)] |
9.DP.15 | Leucosphenite | BaNa4Ti2B2Si10O30 |
9.DP.20 | Prehnite | Ca2Al2Si3O10(OH)2 |
9.DP.30 | Kvanefjeldite | Na4(Ca,Mn)(Si3O7)2(OH)2 |
9.DP.35 | Lemoynite | (Na,K)2CaZr2Si10O26 · 5H2O |
9.DP.35 | Natrolemoynite | Na4Zr2Si10O26 · 9H2O |
9.DP.35 | Hogarthite | (Na,K)2CaTi2Si10O26 · 8H2O |
9.DP.40 | Altisite | Na3K6Ti2Al2Si8O26Cl3 |
9.DP.45 | Chiappinoite-(Y) | Y2Mn(Si3O7)4 |
9.DP.50 | Esquireite | BaSi6O13 · 7H2O |
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 Amstallite
mindat.org URL:
https://www.mindat.org/min-208.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Amstallite
Localities for Amstallite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - 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.
Austria (TL) | |
| Quint (1987) |
Jordan | |
| Dill et al. (2009) |
Quick NavTopAbout AmstalliteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Graphite quarry, Amstall, Mühldorf, Krems-Land District, Lower Austria, Austria