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Acuminite Mineral Data
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General Acuminite Information
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 Chemical Formula: |
SrAlF4(OH)•(H2O) |
| Composition: |
Molecular Weight = 225.62 gm |
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Strontium 38.84 % Sr 45.93 % SrO |
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Aluminum 11.96 % Al 22.60 % Al2O3 |
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Hydrogen 1.34 % H 11.98 % H2O |
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Oxygen 14.18 % O |
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Fluorine 33.68 % F 33.68 % F |
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- %
F -14.18 % -O=F2 |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
SrAlF4(OH)•(H2O) |
| Environment: |
In the Ivigtut cryolite deposit, southwestern Greenland. |
| IMA Status: |
Approved IMA 1987 |
| Locality: |
Greenland, Ivigtut Link to MinDat.org Location Data. |
| Name Origin: |
From the Latin acuminis, sharp point, for spear head, the characteristic shape of the crystals. |
| Name Pronunciation: |
Acuminite + Pronunciation  |
| Synonym: |
ICSD 33830 |
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PDF 48-1870 |
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Acuminite Crystallography
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| Axial Ratios: |
a:b:c =2.5551:1:2.7538 |
| Cell Dimensions: |
a = 13.223, b = 5.175, c = 14.251, Z = 8; beta = 111.61° V = 906.64 Den(Calc)= 3.31 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c |
| X Ray Diffraction: |
By Intensity(I/Io): 3.5049(1), 4.7058(1), 4.7674(1), |
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Physical Properties of Acuminite
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| Cleavage: |
{???} Perfect |
| Color: |
Colorless. |
| Density: |
3.295 |
| Diaphaneity: |
Transparent |
| Hardness: |
3.5 - Copper Penny |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties of Acuminite
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| 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. |
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Calculated Properties of Acuminite
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| Electron Density: |
Bulk Density (Electron Density)=3.11 gm/cc
note: Specific Gravity of Acuminite =3.31 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEAcuminite = 44.23 barns/electron
U=PEAcuminite x rElectron Density= 137.56 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Acuminite is Not Radioactive |
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Acuminite Classification
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| Dana Class: |
11.06.17.01 (11)Halide Complexes; Alumino-fluorides |
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(11.06)with miscellaneous formulae |
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(11.06.17)Dana Group |
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11.06.17.01 Acuminite SrAlF4(OH)•(H2O) C 2/c 2/m |
| Strunz Class: |
03.CC.10 03 - HALIDES |
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03.C - Complex Halides |
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03.CC -Soro-aluminofluorides |
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03.CC.10 Acuminite SrAlF4(OH)•(H2O) C 2/c 2/m |
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03.CC.10 Tikhonenkovite SrAl(OH)F4•(H2O) Unk Mono |
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Other Acuminite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Am.Min.,Vol.73,p1492,1988) OPTIC PROP.(Am.Min.,Vol.73,p1492,1988) |
| 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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Acuminite Specimen Label here :
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Acuminite
SrAlF4(OH)•(H2O)
Dana No: 11.06.17.01 Strunz No: 03.CC.10
Locality:
Notes:
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