Prosopite Mineral Data

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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 % 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

Empirical Formula:

CaAl₂F₆(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

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

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 - PrismaticH-M Symbol (2/m) Space Group: A2/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.35(1), 1.837(0.6), 2.13(0.6),

Forms:

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Forms: ( 0 1 0) ( 1 1 1) ( 1 1 1) ( 1 1 0)

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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

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:

PE_Prosopite= 2.98 barns/electron
U=PE_Prosopite x rElectron 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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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 Español

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: