Mineralogy Database

Creedite Mineral Data

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General Creedite Information

Help on Chemical  Formula: Chemical Formula: Ca3Al2(SO4)(F,OH)10•2(H2O)
Help on Composition: Composition: Molecular Weight = 491.30 gm
   Calcium   24.47 %  Ca   34.24 % CaO
   Aluminum  10.98 %  Al   20.75 % Al2O3
   Hydrogen   1.33 %  H    11.92 % H2O
   Sulfur     6.53 %  S    16.30 % SO3
   Oxygen    27.68 %  O
   Fluorine  29.00 %  F    29.00 % F
               -   %   F   -12.21 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Al2(SO4)F7.5(OH)2.5•2(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1916
Help on Locality: Locality: Wagon Wheel Gap, Creed Quadrangle, Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Creedite Say CREEDITE
Help on Synonym: Synonym: ICSD 31248
  PDF Aug-72

Creedite Image

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Comments: Colorless, bladed creedite crystals.
Location: Mina Navidad, Durango, Mexico. Scale: Crystal size 1.4 cm.
© John Veevaert

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  Creedite   Fluorite

Comments: Well-developed, prismatic, reddish creedite crystals on green fluorite.
Location: Mina Navidad, Rodeo, Durango, Mexico. Scale: 9 x 5 x 5.3 cm.
© Fabre Minerals

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  Creedite   Smithsonite

Comments: Purple transparent crystals of creedite to 6 mm on matrix of creamy botryoidal crystalline smithsonite.
Location: Level 8 San Antonio mine, Santa Eulalia, Chihuahua, Mexico. Scale: 7 x 3.5 x 2 cm.
© Dan Weinrich

Creedite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5046:1:1.1655
Help on Cell Dimensions: Cell Dimensions: a = 12.91, b = 8.58, c = 10, Z = 4; beta = 94.4° V = 1,104.41 Den(Calc)= 2.95
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.48(1), 6.9(0.9), 7.3(0.9),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 2 0 1) ( 2 2 1) ( 1 1 0) ( 1 1 1) ( 0 0 1)

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Physical Properties of Creedite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Colorless, Violet, White.
Help on Density: Density: 2.71
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Creedite

Help on Optical Data: Optical Data: Biaxial (-), a=1.461, b=1.478, g=1.485, bire=0.0240

Calculated Properties of Creedite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Creedite =2.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0009547598
Boson Index = 0.9990452402
Help on Photoelectric: Photoelectric: PECreedite = 3.91 barns/electron
U=PECreedite x rElectron Density= 11.45 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Creedite is Not Radioactive

Creedite Classification

Help on  Dana Class: Dana Class: (12)Compound Halides
  (12.01)with miscellaneous anions
  (12.01.04)Dana Group Creedite Ca3Al2(SO4)(F,OH)10•2(H2O) C 2/c 2/m
Help on  Strunz Class: Strunz Class: 03.CG.15 03 - HALIDES
  03.C - Complex Halides
  03.CG -Aluminofluorides with CO3, SO4, PO4
03.CG.15 Creedite Ca3Al2(SO4)(F,OH)10•2(H2O) C 2/c 2/m

Other Creedite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Creedite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 03.CG.15





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