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."
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
X Ray Diffraction:	By Intensity(I/Io): 4.35(1), 1.837(0.6), 2.13(0.6),
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 Help on Above	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.
Crystal Structure: Mouse drag1 - LMB Manipulate Structure drag2 - RMB Resize/Rotate Keyboard S - Stereo Pair on/off H - Help Screen I - Data Info A - Atoms On/Off P - Polyhedra On/Off B - Bonds On/Off Help on Above	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
Diaphaniety:	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:	None.
Luster:	Vitreous - Dull
Magnetism:	Nonmagnetic
Streak:	white
Optical Properties of Prosopite
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
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:	relectron=2.81 gm/cc note: rProsopite =2.89 gm/cc.
Fermion Index	Fermion Index = 0.00028 Boson Index = 0.99972
Photoelectric:	PEProsopite = 2.98 barns/electron U=PEProsopite x relectron= 8.39 barns/cc.
Radioactivity:	GRapi = 0 (Gamma Ray American Petroleum Institute Units) Prosopite is Not Radioactive
Prosopite Classification
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
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
References:	NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) 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 - Google Images 6 - Google Scholar 7 - Handbook of Mineralogy (MinSocAm) 8 - Handbook of Mineralogy (UofA) 9 - MinDAT 10 - MinMax(Deutsch) 11 - MinMax(English) 12 - Mineralienatlas (Deutsch) 13 - QUT Mineral Atlas 14 - Ruff.Info 15 - WWW-MINCRYST Search for Prosopite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Prosopite : AA Mineral Specimens B & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals The GeoZone Wrights Rock Shop Translate Prosopite Mineral Data : 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: 11.6.9.1 Strunz No: III/C.03-10 Locality:   Notes: