Creedite Mineral Data (original) (raw)

General Creedite Information

Chemical Formula:

Ca3Al2(SO4)(F,OH)10•2(H2O)

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

Empirical Formula:

Ca3Al2(SO4)F7.5(OH)2.5•2(H2O)

IMA Status:

Valid Species (Pre-IMA) 1916

Locality:

Wagon Wheel Gap, Creed Quadrangle, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Creedite

Synonym:

ICSD 31248

PDF Aug-72

Creedite Image

Images:

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

Images:

	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

Images:

	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

Axial Ratios:

a:b:c =1.5046:1:1.1655

Cell Dimensions:

a = 12.91, b = 8.58, c = 10, Z = 4; beta = 94.4° V = 1,104.41 Den(Calc)= 2.95

Crystal System:

Monoclinic - PrismaticH-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),

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Physical Properties of Creedite

Cleavage:

{100} Perfect

Color:

Colorless, Violet, White.

Density:

2.71

Diaphaneity:

Transparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Creedite

Optical Data:

Biaxial (-), a=1.461, b=1.478, g=1.485, bire=0.0240

Calculated Properties of Creedite

Electron Density:

Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Creedite =2.95 gm/cc.

Fermion Index:

Fermion Index = 0.0009547598
Boson Index = 0.9990452402

Photoelectric:

PECreedite = 3.91 barns/electron
U=PECreedite x rElectron Density= 11.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Creedite is Not Radioactive

Creedite Classification

Dana Class:

12.01.04.01 (12)Compound Halides

(12.01)with miscellaneous anions

(12.01.04)Dana Group

12.01.04.01 Creedite Ca3Al2(SO4)(F,OH)10•2(H2O) C 2/c 2/m

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

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Creedite

Ca3Al2(SO4)(F,OH)10•2(H2O)
Dana No: 12.01.04.01 Strunz No: 03.CG.15
Locality:

Notes: