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Amstallite Mineral Data

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General Amstallite Information

Help on Chemical  Formula: Chemical Formula: CaAl(Si,Al)4O8(OH)4•((H2O),Cl)
Help on Composition: Composition: Molecular Weight = 398.85 gm
   Calcium   10.05 %  Ca   14.06 % CaO
   Aluminum  12.18 %  Al   23.01 % Al2O3
   Silicon   23.24 %  Si   49.71 % SiO2
   Hydrogen   1.42 %  H    12.65 % H2O
   Chlorine   1.78 %  Cl    1.78 % Cl
               -   %   Cl   -0.40 % -O=Cl2   
   Oxygen    51.35 %  O
            ______        ______ 
            100.00 %      100.80 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaAl1.8Si3.3O8(OH)4(H2O)0.8Cl0.2
Help on Environment: Environment: In open fissures cutting pegmatitic schlieren, in hydrothermally altered graphite-bearing metamorphic rocks.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: In the Amstall graphite quarry, Amstall, Austria. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the locality.
Help on Name Pronunciation: Name Pronunciation: Amstallite + Pronunciation Say AMSTALLITE
Help on Synonym: Synonym: ICSD 68350
  PDF 41-1420

Amstallite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.6349:1:0.4506
Help on Cell Dimensions: Cell Dimensions: a = 18.83, b = 11.517, c = 5.19, Z = 4; beta = 100.86° V = 1,105.37 Den(Calc)= 2.40
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.75(1), 3.603(1), 3.816(0.9),5.43(0.7), 3.175(0.6), 4.714(0.6), 4.069(0.4),

Physical Properties of Amstallite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Colorless.
Help on Density: Density: 2.4
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Amstallite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.027 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2229,KPDmeas= 0.2229,KC= 0.2292
Ncalc = 1.55
Help on Optical Data: Optical Data: Biaxial (+), a=1.533, b=1.534, g=1.538, bire=0.0050, 2V(Calc)=54, 2V(Meas)=57-59. Dispersion r > v weak.

Calculated Properties of Amstallite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.42 gm/cc
note: Specific Gravity of Amstallite =2.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEAmstallite = 2.61 barns/electron
U=PEAmstallite x rElectron Density= 6.31 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Amstallite is Not Radioactive

Amstallite Classification

Help on  Dana Class: Dana Class: (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.01)with 4-membered rings
  (72.01.04)Dana Group Amstallite CaAl(Si,Al)4O8(OH)4•((H2O),Cl) C 2/c 2/m Rudenkoite! Sr3Al3[(Si,Al)4O10](OH,O)8Cl2•H2O P 2/m, P 2 or Pm Mono
Help on  Strunz Class: Strunz Class: 09.DP.25 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DP -Transitional ino-phyllosilicate structures
09.DP.25 Amstallite CaAl(Si,Al)4O8(OH)4•((H2O),Cl) C 2/c 2/m

Other Amstallite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.73,p1492,1988) OPTIC PROP.(Am.Min.,Vol.73,p1492,1988)
Help on See Also: See Also: Links to other databases for Amstallite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.DP.25





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