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Alwilkinsite-(Y)

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About Alwilkinsite-(Y)Hide

Al Wilkins
Formula:
Y(UO2)3(SO4)2O(OH)3(H2O)7·7H2O
Colour:
Yellowish-green; lemon yellow
Hardness:
2 - 2½
Specific Gravity:
3.371 (Calculated)
Crystal System:
Orthorhombic
Name:
In honour of Alan (Al) J. Wilkins, MD (born 1955), who discovered of the mineral
New structure type.

Chemically related to sejkoraite-(Y), which is the second yttrium-uranyl sulfate mineral currently known. Other Y-UO2 minerals: bijvoetite-(Y), kamotoite-(Y) (carbonates). These three minerals and alwilkinsite-(Y) constitute the whole small group of natural Y-U salts (however, Y-U oxide minerals are also known). One of a few Y-rich sulphate minerals.

The structure is based on edge-sharing chains of uranyl bipyramids, and the sulfate tetrahedra are located outside them. In terms of chain linkage the mineral is close to zippeite. The uranyl-sulfate chains of the mineral are somewhat similar to the corresponding features in uranopilite.



Classification of Alwilkinsite-(Y)Hide

Approved
Approval Year:
2016
First Published:
2017

Physical Properties of Alwilkinsite-(Y)Hide

Colour:
Yellowish-green; lemon yellow
Hardness:
2 - 2½ on Mohs scale
Comment:
ca. 2-2.5
Tenacity:
Brittle
Cleavage:
Perfect
on [010]
Parting:
Slightly flexible before brittle
Fracture:
Splintery
Comment:
Slightly flexible before brittle failure with splintery fracture and perfect cleavage
Density:
3.371 g/cm3 (Calculated)

Optical Data of Alwilkinsite-(Y)Hide

Type:
Biaxial (+)
RI values:
nα = 1.573(1) nβ = 1.581(1) nγ = 1.601(1)
2V:
Measured: 65.3° (1)
Max Birefringence:
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak (r < v)
Pleochroism:
Non-pleochroic
Comments:
Optical orientation: X = c, Y = a, Z = b

Chemical Properties of Alwilkinsite-(Y)Hide

Formula:
Y(UO2)3(SO4)2O(OH)3(H2O)7·7H2O
IMA Formula:
Y(UO2)3(SO4)2O(OH)3(H2O)7 · 7H2O

Crystallography of Alwilkinsite-(Y)Hide

Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
P21 21 21
Setting:
P21 21 21
Cell Parameters:
a = 11.6194(5) Å, b = 12.4250(6) Å, c = 19.4495(14) Å
Ratio:
a:b:c = 0.935 : 1 : 1.565
Unit Cell V:
2807.9 ų
Z:
4
Morphology:
Acicular crystals, needles, elongate on [010], with domatic terminations and exhibits the forms {102}, {301} and {12-4}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.88(100)
7.47(13)
5.621(17)
4.483(18)
3.886(14)
3.322(46)
3.223(13)
3.145(16)

Type Occurrence of Alwilkinsite-(Y)Hide

General Appearance of Type Material:
Needle-like crystals, elongation on [010]; domatic terminations present; observed forms: {102}, {301} and {12_4}
Place of Conservation of Type Material:
Mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA (catalogue number 65629)
Empirical Formula of Type Material:
(Y0.66Dy0.08Gd0.06Er0.05Nd0.03Yb0.03Sm0.02Ce0.01)?0.94(H2O)7[(UO2)3(S1.01O4)2O(OH)3]·7H2O
Geological Setting of Type Material:
Secondary alteration phase
Reference:
Kampf, A.R., Plášil, J., Čejka, J., Marty, J., Škoda, R., Lapčák, L. (2017): Alwilkinsite-(Y), a new rare-earth uranyl sulfate mineral from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine: 81: 895-907.

Synonyms of Alwilkinsite-(Y)Hide

Fluorescence of Alwilkinsite-(Y)Hide

Dull greenish-gray fluorescence

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 Alwilkinsite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Plášil, J., Čejka, J., Marty, J., Škoda, R., Lapčák, L. (2016) Alwilkinsite-(Y), IMA 2015-097. CNMNC Newsletter No. 29, February 2016, 204. Mineralogical Magazine: 80: 199–205.
Kampf, A.R., Plášil, J., Čejka, J., Marty, J., Škoda, R., Lapčák, L. (2017): Alwilkinsite-(Y), a new rare-earth uranyl sulfate mineral from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine: 81: 895-907.
Campostrini, I. (2017): Alwilkinsite-(Y): secondo ritrovamento mondiale nel giacimento uranifero di Limes, Val Daone, Trento. Micro, .15, 92-95.

Internet Links for Alwilkinsite-(Y)Hide

Localities for Alwilkinsite-(Y)Hide

ⓘ - 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.
Italy
 
  • Trentino-South Tyrol
    • Trento
      • Giudicarie Valleys
        • Chiese Valley
          • Daone
            • Daone Valley
              • Limes
Campostrini, I (2017): Alwilkinsite-(Y): secondo ritrovamento mondiale nel giacimento uranifero di Limes, Val Daone, Trento. Micro, 15, 2-2017, 92-95.
USA (TL)
 
  • Utah
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Kampf, A.R., Plášil, J., Čejka, J., Marty, J., Škoda, R., Lapčák, L. (2016) Alwilkinsite-(Y), IMA 2015-097. CNMNC Newsletter No. 29, February 2016, 204. Mineralogical Magazine: 80: 199–205.; Kampf, A.R., Plášil, J., Čejka, J., Marty, J., Škoda, R., Lapčák, L. (2017): Alwilkinsite-(Y), a new rare-earth uranyl sulfate mineral from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine, 81, 895-907.
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