Prosopite Mineral Data + Say PROSOPITE

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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 Synonym: Synonym: ICSD 10267
  PDF 5-307
 

Prosopite Image

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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:

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Forms: [ 0 1 0] [ 1 1 1] [ 1 1 1] [ 1 1 0]

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Click Here for Large Prosopite Structure Window Crystal Structure:

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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 Diaphaniety: Diaphaniety: 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: None.
Help on Luster: Luster: Vitreous - Dull
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Prosopite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.073 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1699,KPDmeas= 0.1749,KC= 0.1833
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:

relectron=2.81 gm/cc
note: rProsopite =2.89 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00028
Boson Index = 0.99972
Help on Photoelectric: Photoelectric:

PEProsopite = 2.98 barns/electron
U=PEProsopite x relectron= 8.39 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: 11.6.9.1 (11)Halide Complexes; Alumino-fluorides
  (11.6)with miscellaneous formulae
  (11.6.9)Dana Group
 
11.6.9.1 Prosopite CaAL2(F,OH)8 A2/a 2/m
Help on  Strunz Class: Strunz Class: III/C.03-10 III - Halogenides
  III/C - Double halogenides with water, Fluorides
  III/C.03 - Prosopite - Boldyrevite series
 
III/C.03-10 Prosopite CaAL2(F,OH)8 A2/a 2/m
 
III/C.03-20 Chiolite Na5Al3F14 P 4/mnc 4/m 2/m 2/m
 
III/C.03-30 Weberite Na2MgAlF7 I mma 2/m 2/m 2/m
 
III/C.03-40 Usovite Ba2CaMgAl2F14 C 2/c or Cc Mono
 
III/C.03-45 Karasugite SrCaAl(F,OH)7 P 21/c 2/m
 
III/C.03-50 Carlhintzeite Ca2AlF7·(H2O) C1,C1 Tri
 
III/C.03-55 Rosenbergite AlF3·3(H2O) P 4/n 4/m
 
III/C.03-60 Ralstonite NaxMgxAl2-x(F,OH)6·(H2O) F d3m 4/m 3 2/m
 
III/C.03-70 Neighborite NaMgF3 Pcmn 2/m 2/m 2/m
 
III/C.03-80 Boldyrevite* NaCaMgAl3F14·4(H2O) None
 

Other Prosopite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Prosopite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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

Prosopite

CaAL2(F,OH)8
Dana No: 11.6.9.1 Strunz No: III/C.03-10
Locality:

 

Notes:

 

 
   
 
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