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Atelisite-(Y)

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About Atelisite-(Y)Hide

Formula:
Y4Si3O8(OH)8
Colour:
Pale brown to colorless
Lustre:
Vitreous
Specific Gravity:
4.26 (Calculated)
Crystal System:
Tetragonal
Name:
From the Greek ατελής, deficient, in allusion to the Si-deficiency of the mineral.
An unusual hydrous yttrium silicate with a KDP-type (monopotassium phosphate) structure.
The X-ray powder diffraction pattern is similar to that of xenotime.


Classification of Atelisite-(Y)Hide

Approved
Approval Year:
2010
First Published:
2012

Physical Properties of Atelisite-(Y)Hide

Vitreous
Transparency:
Transparent
Colour:
Pale brown to colorless
Streak:
Colorless
Density:
4.26 g/cm3 (Calculated)

Optical Data of Atelisite-(Y)Hide

Type:
Uniaxial (+)
RI values:
nω = 1.727 nε = 1.800
Max Birefringence:
δ = 0.073
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of Atelisite-(Y)Hide

Formula:
Y4Si3O8(OH)8
IMA Formula:
Y4Si3O8(OH)8

Crystallography of Atelisite-(Y)Hide

Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
I4 2d
Setting:
I4 2d
Cell Parameters:
a = 6.947(4) Å, c = 6.133(3) Å
Ratio:
a:c = 1 : 0.883
Unit Cell V:
295.98 ų
Morphology:
Dipyramidally terminated, short-prismatic habit with a diameter of up to 0.3 mm. Observed forms: {101},{100}and {001}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.581(45)
3.465(100)
2.766(31)
2.596(58)
2.453(20)
2.161(26)
1.841(23)
1.780(52)
Comments:
Pattern is similar to that of xenotime.

Type Occurrence of Atelisite-(Y)Hide

General Appearance of Type Material:
As a late, hydrothermally formed phase which occurs as euhedral microcrystals in
dissolution cavities in yttrian fluorite.
Place of Conservation of Type Material:
In the collections of the Mineralogical Museum of the University of Hamburg, Hamburg, Germany, catalogue number NO-004
Empirical Formula of Type Material:
(Y3.11Yb0.46 Er0.19Dy0.11Gd0.09Ho0.01Tb0.023.99Si2.40O16H10.43
Chemical Analysis of Type Material:
SiO218.73 %
Y2O345.67 %
Yb2O311.81 %
Gd2O32.09 %
Tb2O30.54 %
Dy2O32.61 %
Ho2O30.62 %
Er2O34.72 %
H2O calc12.2 %
Total:98.99 %
Geological Setting of Type Material:
Granitic pegmatite (NYF type)
Associated Minerals at Type Locality:
Reference:
Malcherek, T., Mihailová, B., Schlüter, J., Husdal, T. (2012): Atelisite-(Y), a new rare earth defect silicate of the KDP structure type. European Journal of Mineralogy, 24: 1053-1060

Synonyms of Atelisite-(Y)Hide

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 Atelisite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Malcherek, T., Mihailova, B., Schlüter, J. and Husdal, T.A. (2011): Atelisite-(Y), IMA 2010-065. CNMNC Newsletter No. 9, August 2011, page 2536; Mineralogical Magazine. 75, 2535-2540
Malcherek, T., Mihailová, B., Schlüter, J., Husdal, T. (2012): Atelisite-(Y), a new rare earth defect silicate of the KDP structure type. European Journal of Mineralogy, 24, 1053-1060.

Internet Links for Atelisite-(Y)Hide

Localities for Atelisite-(Y)Hide

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.
Norway (TL)
 
  • Nordland
    • Tysfjord
Malcherek, T., Mihailova, B., Schlüter, J. and Husdal, T.A. (2011): Atelisite-(Y), IMA 2010-065. CNMNC Newsletter No. 9, August 2011, page 2536; Mineralogical Magazine. 75, 2535-2540; Malcherek, T., Mihailová, B., Schlüter, J., Husdal, T. (2012): Atelisite-(Y), a new rare earth defect silicate of the KDP structure type. European Journal of Mineralogy, 24, 1053-1060.
Mineral and/or Locality  
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