Mineralogy Database

Angastonite Mineral Data

Search Webmineral :

General Angastonite Information

Help on Chemical  Formula: Chemical Formula: CaMgAl2(PO4)2(OH)4?7H2O
Help on Composition: Composition: Molecular Weight = 502.43 gm
   Calcium      7.98 %  Ca   11.16 % CaO
   Magnesium    4.84 %  Mg    8.02 % MgO
   Aluminum    10.74 %  Al   20.29 % Al2O3
   Phosphorus  12.33 %  P    28.25 % P2O5
   Hydrogen     3.61 %  H    32.27 % H2O
   Oxygen      60.50 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMgAl2(PO4)2(OH)4•7(H2O)
Help on Environment: Environment: Penrice marble quarry. Related to the montgomeryite-group.
Help on IMA Status: IMA Status: Approved IMA 2008 (Dana # Added)
Help on Locality: Locality: Angaston, in the Mount Lofty Ranges, 100 km NNE of Adelaide, South Australia, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2008-008

Angastonite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: SEM image of platy, striated crystals of angastonite.
Location: Angaston, South Australia. Scale: Unknown.
© Mineralogical Magazine

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: White acicular to short prismatic crystals of angastonite covering a dark matrix.
Location: Penrice quarry, Angaston, South Australia, Australia. Scale: Overall: 5.5 x 3.5 x 2 cm.
© Tom Loomis / Dakota Matrix

Angastonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4923:1:0.226
Help on Cell Dimensions: Cell Dimensions: a = 13.303, b = 27.02, c = 6.107, Z = 6; alpha = 89.64°, beta = 83.44°, gamma = 80.444° V = 2,150.47 Den(Calc)= 2.33
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 13.38(1), 11.05(0.25), 5.73(0.23),8.01(0.21),

Physical Properties of Angastonite

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: White.
Help on Density: Density: 2.47
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Pearly
Help on Streak: Streak: white

Optical Properties of Angastonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2464,KPDmeas= 0.2324,KC= 0.2429
Ncalc = 1.57 - 1.6
Help on Optical Data: Optical Data: Biaxial (+), a=1.566, b=1.572, g=1.584, bire=0.0180, 2V(Calc)=72, 2V(Meas)=70. Dispersion dispersion not observed.

Calculated Properties of Angastonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.39 gm/cc
note: Specific Gravity of Angastonite =2.33 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0052410621
Boson Index = 0.9947589379
Help on Photoelectric: Photoelectric: PEAngastonite = 2.04 barns/electron
U=PEAngastonite x rElectron Density= 4.89 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Angastonite is Not Radioactive

Angastonite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.08)Montgomeryite group Montgomeryite Ca4MgAl4(PO4)6(OH)4•12(H2O) C 2/c 2/m Kingsmountite (Ca,Mn)4(Fe,Mn)Al4(PO4)6(OH)4•12(H2O) C 2 2 Calcioferrite Ca4Fe(Fe,Al)4(PO4)6(OH)4•12(H2O) C 2 2 Zodacite Ca4MnFe4(PO4)6(OH)4•12(H2O) C 2/c,Cc Mono Angastonite! CaMgAl2(PO4)2(OH)4?7H2O P1 1
Help on  Strunz Class: Strunz Class: 08.DL.25 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DL -With large and medium-sized cations, (OH, etc.):RO4 = 2:1
08.DL.25 Angastonite! CaMgAl2(PO4)2(OH)4?7H2O P1 1

Other Angastonite Information

Help on References: References: NAME( MinMag, v72:1011) PHYS. PROP.(MinMag, v72:1011) OPTIC PROP.(MinMag, v72:1011)
Help on See Also: See Also: Links to other databases for Angastonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Angastonite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Angastonite :

Ask about Angastonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa�ol

Print or Cut-and-Paste your Angastonite Specimen Label here :


Dana No: Strunz No: 08.DL.25





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.