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Amstallite

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Formula:
CaAl(Si,Al)4O8(OH)4 · (H2O,Cl)
Colour:
Colourless
Lustre:
Vitreous
Hardness:
3 - 5
Crystal System:
Monoclinic
Name:
Named after the type locality at Amstall, Lower Austria, Austria.
This page provides mineralogical data about Amstallite.


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Classification of AmstalliteHide

Approved
First Published:
1987
9.DP.25

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
16.9.32

16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca

Physical Properties of AmstalliteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless
Hardness:
3 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
good on {100}
Fracture:
Conchoidal

Optical Data of AmstalliteHide

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.
Surface Relief:
Low
Dispersion:
r > v weak

Chemical Properties of AmstalliteHide

Formula:
CaAl(Si,Al)4O8(OH)4 · (H2O,Cl)

Crystallography of AmstalliteHide

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°
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.
Comment:
Space group C2/c

Type Occurrence of AmstalliteHide

Place of Conservation of Type Material:
Institute of Mineralogy and Crystallography, Vienna University; Natural History Museum, Vienna, Austria.
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 AmstalliteHide

Other Language Names for AmstalliteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Pyrite1 photo of Amstallite associated with Pyrite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DP.05Meliphanite(Ca,Na)2(Be,Al)[Si2O6(OH,F)]Tet. 4 : I4
9.DP.15LeucospheniteBaNa4Ti2B2Si10O30Mon.
9.DP.20PrehniteCa2Al2Si3O10(OH)2Orth. mm2
9.DP.30KvanefjelditeNa4(Ca,Mn)(Si3O7)2(OH)2Orth.
9.DP.35Lemoynite(Na,K)2CaZr2Si10O26 · 5H2OMon. 2/m : B2/b
9.DP.35NatrolemoyniteNa4Zr2Si10O26•9H2OMon. 2/m : B2/m
9.DP.40AltisiteNa3K6Ti2Al2Si8O26Cl3Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.9.1GehleniteCa2Al(AlSiO7)Tet. 4 2m : P4 21m
16.9.2AnorthiteCa(Al2Si2O8)Tric. 1 : P1
16.9.3Yoshiokaite(Ca,Na)[Al(Al,Si)O4]Trig. 3 : P3
16.9.4SvyatoslaviteCa(Al2Si2O8)Orth.
16.9.5DmisteinbergiteCa(Al2Si2O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
16.9.6GrossularCa3Al2(SiO4)3Iso. m3m (4/m 3 2/m) : Ia3d
16.9.7VuagnatiteCaAl(SiO4)(OH)Orth.
16.9.8Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
16.9.9Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
16.9.10PrehniteCa2Al2Si3O10(OH)2Orth. mm2
16.9.11KamaishiliteCa2(Al2SiO6)(OH)2Tet.
16.9.12BicchuliteCa2(Al2SiO6)(OH)2Iso. 4 3m : I4 3m
16.9.13MargariteCaAl2(Al2Si2O10)(OH)2Mon.
16.9.14ChantaliteCaAl2(SiO4)(OH)4Tet. 4/m : I41/a
16.9.15CebolliteCa5Al2(SiO4)3(OH)4Orth.
16.9.17KatoiteCa3Al2(SiO4)3-x(OH)4xIso.
16.9.18LawsoniteCaAl2(Si2O7)(OH)2 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
16.9.19ParthéiteCa2(Si4Al4) O15 (OH)2•4H2OMon. 2/m : B2/b
16.9.20WairakiteCa(Al2Si4O12) · 2H2OMon. 2/m
16.9.21VertumniteCa4Al4Si4O6(OH)24 · 3H2OMon. 2/m : P21/m
16.9.22ScoleciteCaAl2Si3O10 · 3H2OMon. m : Bb
16.9.23LaumontiteCaAl2Si4O12 · 4H2OMon. 2/m : B2/m
16.9.24YugawaraliteCaAl2Si6O16 · 4H2OMon.
16.9.25Gismondine-CaCaAl2Si2O8 · 4H2O
16.9.26EpistilbiteCaAl2Si6O16 · 5H2OMon.
16.9.27GoosecreekiteCa[Al2Si6O16] · 5H2OMon.
16.9.28CowlesiteCaAl2Si3O10 · 6H2OOrth.
16.9.30StelleriteCa4(Si28Al8)O72 · 28H2OOrth. mmm (2/m 2/m 2/m) : Fmmm
16.9.31SträtlingiteCa2Al2SiO7 · 8H2OTrig.

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 AmstalliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Jambor, J.L., Burke, E.A.J., Ercit, T.S., Grice, J.D. (1988) New mineral names. American Mineralogist: 73: 1492-1499.

Internet Links for AmstalliteHide

Localities for AmstalliteHide

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.
Austria (TL)
 
  • Lower Austria
    • Waldviertel
      • Mühldorf
        • Amstall
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.
Jordan
 
  • Karak
Dill, H. G., Kus, J., Abed, A. M., Sachsenhofer, R. F., & Abul Khair, H. (2009). Diagenetic and epigenetic alteration of Cretaceous to Paleogene organic-rich sedimentary successions in northwestern Jordan, typical of the western margin of the Arabian Plate. GeoArabia, 14(2), 101-140.
Mineral and/or Locality  
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