Prosopite Mineral Data

Prosopite Mineral Data
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General Prosopite Information

Help on Chemical Formula: Chemical Formula: CaAL2(F,OH)8
Help on Composition: Composition: Molecular Weight = 242.05 gm
   Calcium   16.56 %  Ca   23.17 % CaO
   Aluminum  22.29 %  Al   42.12 % Al2O3
   Hydrogen   0.83 %  H     7.44 % H2O
   Oxygen    13.22 %  O
   Fluorine  47.09 %  F    47.09 % F
               -   %   F   -19.83 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaAl2F6(OH)2
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1853
Help on Locality: Locality: St. Peter's Dome near Pike's Peak, Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek prosopon - "mask."
Help on Name Pronunciation: Name Pronunciation: Prosopite + Pronunciation Say PROSOPITE
Help on Synonym: Synonym: ICSD 10267
  PDF 5-307
 

Prosopite Image

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

Comments: Pale violet prosopite microcrystals.
Location: Ivigtut, Greenland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Prosopite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.6588:1:0.6021
Help on Cell Dimensions: Cell Dimensions: a = 7.32, b = 11.11, c = 6.69, Z = 4; beta = 95° V = 542.00 Den(Calc)= 2.97
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.35(1), 1.837(0.6), 2.13(0.6),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
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Forms: ( 0 1 0) ( 1 1 1) ( 1 1 1) ( 1 1 0)

Warning: this large pop-up is very compute intensive and may not work well with some computers.
Click Here for Large Prosopite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
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B - Bonds On/Off
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Pudovkina Z V , Chernitsova N M , Pyatenko Y A , Journal of Structural Chemistry , 14 (1973) p.345-347, Refinement of the crystalline structure of prosopite, CaAl2F4(OH)4

 

Physical Properties of Prosopite

Help on Cleavage: Cleavage: {111} Perfect, {111} Perfect, {111} Perfect
Help on Color: Color: White, Greenish white, Reddish white.
Help on Density: Density: 2.88 - 2.89, Average = 2.88
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: Fluorescent, Short UV=sky blue blue white, Long UV=sky blue blue white.
Help on Luster: Luster: Vitreous - Dull
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Prosopite

Help on Optical Data: Optical Data: Biaxial (+), a=1.501, b=1.503, g=1.51, bire=0.0090, 2V(Calc)=58, 2V(Meas)=62.75. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Prosopite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.90 gm/cc
note: Specific Gravity of Prosopite =2.97 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002882388
Boson Index = 0.9997117612
Help on Photoelectric: Photoelectric: PEProsopite = 2.98 barns/electron
U=PEProsopite x rElectron Density= 8.63 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Prosopite is Not Radioactive
 

Prosopite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Ford32)
Help on See Also: 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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Ask about Prosopite 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 Espaņol

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

Prosopite

CaAL2(F,OH)8
Dana No: 11.06.09.01 Strunz No: 03.CD.10
Locality:

 

Notes: