Wavellite Mineral Data (original) (raw)

General Wavellite Information

Chemical Formula:

Al3(PO4)2(OH,F)3•5(H2O)

Composition:

Molecular Weight = 421.48 gm

Aluminum 19.20 % Al 36.29 % Al2O3

Phosphorus 14.70 % P 33.68 % P2O5

Hydrogen 3.11 % H 27.78 % H2O

Oxygen 60.74 % O

Fluorine 2.25 % F 2.25 % F

- % F -0.95 % -O=F2

______ ______

100.00 % 99.05 % = TOTAL OXIDE

Empirical Formula:

Al3(PO4)2(OH)3F0.5•5(H2O)

Environment:

Secondary mineral common in aluminous low-grade metamorphic rocks and phosphate rocks.

IMA Status:

Valid Species (Pre-IMA) 1805

Locality:

High Down quarry, Barnstaple, Devonshire, England. Link to MinDat.org Location Data.

Name Origin:

Named after William Wavell (?-1829) of England who discovered the mineral.

Name Pronunciation:

Wavellite + Pronunciation

Synonym:

Coeruleolactite - mixture of planerite + variscite + wavellite

ICSD 26816

PDF 41-1360

Wavellite Image

Images:

	Wavellite Comments: Green prismatic crystals of wavellite in complete radial stellar aggregate. Location: Flinders Range, South Australia, Australia.Scale: Sphere size 8 mm. © Tom Loomis / Dakota Matrix

Wavellite Crystallography

Axial Ratios:

a:b:c =0.8795:1:0.4029

Cell Dimensions:

a = 15.25, b = 17.338, c = 6.986, Z = 6; V = 1,847.13 Den(Calc)= 2.27

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcmn

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

By Intensity(I/Io): 8.42(1), 8.67(1), 3.22(0.6),

Forms:

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Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
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I - Indicies
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| | Forms:( 0 1 0) ( 1 1 0) ( 1 0 1) ( 1 0 0) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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| | Araki T , Zoltai T , Zeitschrift fur Kristallographie , 127 (1968) p.21-33, The crystal structure of wavellite, Locality: Montgomery County, Arkansas, USA | | ------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Wavellite

Cleavage:

{110} Perfect, {101} Good

Color:

Blue, Brown, Brownish black, Colorless, Green.

Density:

2.3 - 2.4, Average = 2.34

Diaphaneity:

Translucent

Fracture:

Fibrous - Thin, elongated fractures produced by crystal forms or intersecting cleavages (e.g. asbestos).

Habit:

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

Habit:

Stalactitic - Shaped like pendant columns as stalactites or stalagmites (e.g. calcite).

Habit:

Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luminescence:

Fluorescent, Short UV=yellow sky blue, Long UV=yellow strong sky blue.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Wavellite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2372,KPDmeas= 0.2291,KC= 0.2323
Ncalc = 1.53 - 1.56

Optical Data:

Biaxial (+), a=1.52-1.535, b=1.526-1.543, g=1.545-1.561, bire=0.0250-0.0260, 2V(Calc)=60-70, 2V(Meas)=72. Dispersion none.

Pleochroism (x):

bluish green or green.

Pleochroism (y):

pale yellow or colorless.

Calculated Properties of Wavellite

Electron Density:

Bulk Density (Electron Density)=2.39 gm/cc
note: Specific Gravity of Wavellite =2.35 gm/cc.

Fermion Index:

Fermion Index = 0.0002961929
Boson Index = 0.9997038071

Photoelectric:

PEWavellite = 1.34 barns/electron
U=PEWavellite x rElectron Density= 3.22 barns/cc.

Radioactivity:

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

Wavellite Classification

Dana Class:

42.10.02.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.10)where (AB)3 (XO4)2 Zq � x(H2O)

(42.10.02)Wavellite Group

42.10.02.01 Wavellite Al3(PO4)2(OH,F)3•5(H2O) Pcmn 2/m 2/m 2/m

42.10.02.02 Allanpringite! Fe3(PO4)2(OH)3•5H2O P 21/n pseudo-ortho 2/m

Strunz Class:

08.DC.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DC -With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1

08.DC.50 Wavellite Al3(PO4)2(OH,F)3•5(H2O) Pcmn 2/m 2/m 2/m

08.DC.50 Allanpringite! Fe3(PO4)2(OH)3•5H2O P 21/n pseudo-ortho 2/m

Other Wavellite Information

References:

NAME( Sinkankas66) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Sinkankas66)

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Ask about Wavellite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Wavellite Specimen Label here :

Wavellite

Al3(PO4)2(OH,F)3•5(H2O)
Dana No: 42.10.02.01 Strunz No: 08.DC.50
Locality:

Notes: