Prosopite Mineral Data
General Prosopite Information
Chemical Formula:
CaAL2(F,OH)8
Composition:
Molecular Weight = 242.05 gm
Calcium 16.56 % Ca 23.17 % CaO
Aluminum 22.29 % Al 42.12 % Al2 O3
Hydrogen 0.83 % H 7.44 % H2 O
Oxygen 13.22 % O
Fluorine 47.09 % F 47.09 % F
- %
F -19.83 % -O=F2
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
CaAl2 F6 (OH)2
IMA Status:
Valid Species (Pre-IMA) 1853
Locality:
St. Peter's Dome near Pike's Peak, Colorado, USA. Link to MinDat.org Location Data.
Name Origin:
From the Greek prosopon - "mask."
Name Pronunciation:
Prosopite + Pronunciation
Synonym:
ICSD 10267
PDF 5-307
Prosopite Image
Images:
Prosopite Crystallography
Axial Ratios:
a:b:c =0.6588:1:0.6021
Cell Dimensions:
a = 7.32, b = 11.11, c = 6.69, Z = 4; beta = 95° V = 542.00 Den(Calc)= 2.97
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/a
X Ray Diffraction:
By Intensity(I/Io ): 4.35(1), 1.837(0.6), 2.13(0.6),
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Physical Properties of Prosopite
Cleavage:
{111} Perfect, {111} Perfect, {111} Perfect
Color:
White, Greenish white, Reddish white.
Density:
2.88 - 2.89, Average = 2.88
Diaphaneity:
Transparent
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Hardness:
4-5 - Fluorite-Apatite
Luminescence:
Fluorescent, Short UV=sky blue blue white, Long UV=sky blue blue white.
Luster:
Vitreous - Dull
Magnetism:
Nonmagnetic
Streak:
white
Optical Properties of Prosopite
Optical Data:
Biaxial (+), a=1.501, b=1.503, g=1.51, bire=0.0090, 2V(Calc)=58, 2V(Meas)=62.75. Dispersion none.
Pleochroism (x):
colorless.
Pleochroism (y):
colorless.
Pleochroism (z):
colorless.
Calculated Properties of Prosopite
Electron Density:
Bulk Density (Electron Density)=2.90 gm/cc note: Specific Gravity of Prosopite =2.97 gm/cc.
Fermion Index:
Fermion Index = 0.0002882388 Boson Index = 0.9997117612
Photoelectric:
PEProsopite = 2.98 barns/electronU=PEProsopite x r Electron Density= 8.63 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Prosopite is Not Radioactive
Prosopite Classification
Dana Class:
11.06.09.01 (11) Halide Complexes; Alumino-fluorides
(11.06) with miscellaneous formulae
(11.06.09) Dana Group
11.06.09.01 Prosopite CaAL2(F,OH)8 A2/a 2/m
Strunz Class:
03.CD.10 03 - HALIDES
03.C - Complex Halides
03.CD -Ino-aluminofluorides
03.CD.10 Prosopite CaAL2(F,OH)8 A2/a 2/m
Other Prosopite Information
References:
NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Prosopite :
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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Prosopite
CaAL2(F,OH)8
Dana No: 11.06.09.01 Strunz No: 03.CD.10
Locality:
Notes:
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