Mineralogy Database

Acuminite Mineral Data

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General Acuminite Information

Help on Chemical  Formula: Chemical Formula: SrAlF4(OH)•(H2O)
Help on Composition: Composition: Molecular Weight = 225.62 gm
   Strontium  38.84 %  Sr   45.93 % SrO
   Aluminum   11.96 %  Al   22.60 % Al2O3
   Hydrogen    1.34 %  H    11.98 % H2O
   Oxygen     14.18 %  O
   Fluorine   33.68 %  F    33.68 % F
                -   %   F   -14.18 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SrAlF4(OH)•(H2O)
Help on Environment: Environment: In the Ivigtut cryolite deposit, southwestern Greenland.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Greenland, Ivigtut Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Latin acuminis, sharp point, for spear head, the characteristic shape of the crystals.
Help on Name Pronunciation: Name Pronunciation: Acuminite + Pronunciation Say ACUMINITE
Help on Synonym: Synonym: ICSD 33830
  PDF 48-1870

Acuminite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.5551:1:2.7538
Help on Cell Dimensions: Cell Dimensions: a = 13.223, b = 5.175, c = 14.251, Z = 8; beta = 111.61° V = 906.64 Den(Calc)= 3.31
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): 3.5049(1), 4.7058(1), 4.7674(1),

Physical Properties of Acuminite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Colorless.
Help on Density: Density: 3.295
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Acuminite

Help on Optical Data: Optical Data: Biaxial (+), a=1.4507, b=1.4528, g=1.4624-1.4627, bire=0.0117-0.0120, 2V(Calc)=50-52, 2V(Meas)=46-57.

Calculated Properties of Acuminite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Acuminite =3.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEAcuminite = 44.23 barns/electron
U=PEAcuminite x rElectron Density= 137.56 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Acuminite is Not Radioactive

Acuminite Classification

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.06)with miscellaneous formulae
  (11.06.17)Dana Group Acuminite SrAlF4(OH)•(H2O) C 2/c 2/m
Help on  Strunz Class: Strunz Class: 03.CC.10 03 - HALIDES
  03.C - Complex Halides
  03.CC -Soro-aluminofluorides
03.CC.10 Acuminite SrAlF4(OH)•(H2O) C 2/c 2/m
03.CC.10 Tikhonenkovite SrAl(OH)F4•(H2O) Unk Mono

Other Acuminite Information

Help on References: References: NAME( AntBidBlaNic3) 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 Acuminite :
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: 03.CC.10





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