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Wilancookite

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About WilancookiteHide

William and Anne Cook
Formula:
(Ba,K,Na)8(Ba,Li,□)6Be24P24O96·32H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
3.05 (Calculated)
Crystal System:
Isometric
Name:
Named after William ("Bill")(1927-2006) and Anne (1928- ) Cook, an avid mineral collector couple. Bill had a PhD in geology, and was a crystallographer at Clevite Research, which became part of Gould. When that company closed its research center in Cleveland, he with several others founded Cleveland Crystals, Inc., which became a preeminent grower of electro-optic and nonlinear crystals. He also served for many years as adjunct curator of mineralogy at the Cleveland Museum of Natural History. Anne, a mathematician, worked in the engineering department of AT&T and later as a math tutor at two high schools in the Cleveland area. She served as president of the Midwest Federation of Mineralogical Societies, and for many years as secretary of the American Federation of Mineralogical Societies. Both Bill and Anne, at various times, served as president both of the Mineralogical Society of Cleveland and of the Micromineral Society of the Cleveland Museum of Natural History.
Related to pahasapaite.
Wilancookite and pahasapaite are the only known phosphate minerals with a zeolite-type topology.


Classification of WilancookiteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of WilancookiteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Hardness:
4 - 5 on Mohs scale
Comment:
Estimated
Tenacity:
Brittle
Density:
3.05 g/cm3 (Calculated)

Optical Data of WilancookiteHide

Type:
Isotropic
RI values:
n = 1.560(2)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of WilancookiteHide

Formula:
(Ba,K,Na)8(Ba,Li,□)6Be24P24O96·32H2O
IMA Formula:
(Ba,K,Na)8(Ba,Li,◻)6Be24P24O96 · 32H2O

Crystallography of WilancookiteHide

Crystal System:
Isometric
Class (H-M):
2 3 - Tetartoidal
Space Group:
I2 3
Cell Parameters:
a = 13.5398(2) Å
Unit Cell V:
2,482.20 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Dodecahedral {110} crystals

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.90(60)
5.54(80)
3.630(60)
3.212(70)
3.043(100)
2.885(70)
2.774(80)
2.398(60)

Occurrences of WilancookiteHide

Paragenetic Mode(s):

Type Occurrence of WilancookiteHide

General Appearance of Type Material:
As tiny dodecahedral crystals, deposited on moraesite fibres
Place of Conservation of Type Material:
Cotype material is deposited in the collections of the Laboratory of Mineralogy, University of Liège, catalogue number 20394, and the Natural History Museum of Luxembourg, catalogue number 2011-33.
Empirical Formula of Type Material:
(Ba7.54K0.32Na0.148.00(Ba3.04Li1.57?1.396.00Be24.08(P23.88Al0.38Si0.0324.29O96·32H2O
Chemical Analysis of Type Material:
P2O536.19 %
SiO20.04 %
Al2O30.41 %
BaO34.65 %
Na2O0.09 %
K2O0.32 %
BeO12.86 %
Li2O0.50 %
H2Ocalc12.31 %
Total:97.37 %
Geological Setting of Type Material:
Complex granitic pegmatite
Associated Minerals at Type Locality:
Reference:
Hatert, F., Philippo, S., Ottolini, L., Dal Bo, F., Scholz, R., Chaves, M.L.S.C., Yang, H., Downs, R.T., Menezes Filho, L.A.D. (2017) Wilancookite, (Ba,K,Na)8(Ba,Li,◻)6Be24P24O96·32H2O, a new beryllophosphate with a zeolite framework. European Journal of Mineralogy: 29: 923-930.

Synonyms of WilancookiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Moraesite1 photo of Wilancookite associated with Moraesite on mindat.org.
Zanazziite1 photo of Wilancookite associated with Zanazziite on mindat.org.

Fluorescence of WilancookiteHide

Non-fluorescent

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for WilancookiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Menezes Filho, L.A.D., Hatert, F., Philippo, S., Ottolini, L., Dal Bo, F., Scholz, R., Chaves, M.L.S.C., Yang, H. and Downs, R.T. (2015) Wilancookite, IMA 2015-034. CNMNC Newsletter No. 27, October 2015, page 1228. Mineralogical Magazine: 79: 1229–1236.
Hatert, F., Philippo, S., Ottolini, L., Dal Bo, F., Scholz, R., Chaves, M.L.S.C., Yang, H., Downs, R.T., Menezes Filho, L.A.D. (2017) Wilancookite, (Ba,K,Na)8(Ba,Li,◻)6Be24P24O96·32H2O, a new beryllophosphate with a zeolite framework. European Journal of Mineralogy: 29: 923-930.

Internet Links for WilancookiteHide

Localities for WilancookiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil (TL)
 
  • Minas Gerais
    • Itinga
      • Taquaral
        • Piauí valley
Menezes Filho, L.A.D., Hatert, F., Philippo, S., Ottolini, L., Dal Bo, F., Scholz, R., Chaves, M.L.S.C., Yang, H. and Downs, R.T. (2015) Wilancookite, IMA 2015-034. CNMNC Newsletter No. 27, October 2015, page 1228; Mineralogical Magazine, 79, 1229–1236.; Hatert, F., Philippo, S., Ottolini, L., Dal Bo, F., Scholz, R., Chaves, M.L.S.C., Yang, H., Downs, R.T., Menezes Filho, L.A.D. (2017): Wilancookite, (Ba,K,Na)8(Ba,Li,◻)6Be24P24O96·32H2O, a new beryllophosphate with a zeolite framework. European Journal of Mineralogy: 29: 923-930
Mineral and/or Locality  
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