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Alnaperbøeite-(Ce)

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Formula:
(CaCe2.5Na0.5)(Al4)(Si2O7)(SiO4)3O(OH)2
Colour:
grayish very pale green
Lustre:
Vitreous
Hardness:
6 - 7
Specific Gravity:
4.308 (Calculated)
Crystal System:
Monoclinic
Name:
Emphasizes the chemical relationships with perbøeite-(Ce), the dominance of Al in the M3 site and the role of Na to charge balance the dominance of a trivalent cation in the M3 site of the REE-epidote module.
Member of a polysomatic series having epidote and törnebohmite as end-members.


Forms a continuous solid-solution series with perbøeite-(Ce). Members of the perbøeite-(Ce)–alnaperbøeite-(Ce) solid solution are topologically identical to the minerals gatelite-(Ce) and västmanlandite-(Ce).
For photos see Alnaperbøeite-(Ce)-Perbøeite-(Ce) Series.


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Classification of Alnaperbøeite-(Ce)Hide

Approved
Approval Year:
2012

Physical Properties of Alnaperbøeite-(Ce)Hide

Vitreous
Transparency:
Transparent
Colour:
grayish very pale green
Streak:
white
Hardness:
6 - 7 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{100} good, {001} imperfect
Fracture:
Irregular/Uneven
Density:
4.308 g/cm3 (Calculated)

Optical Data of Alnaperbøeite-(Ce)Hide

Type:
Biaxial (+)
RI values:
nα = 1.778(2) nβ = 1.784(2) nγ = 1.810(5)
2V:
Measured: 33.5° (5)
Max Birefringence:
δ = 0.032
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
inclined
Pleochroism:
Non-pleochroic

Chemical Properties of Alnaperbøeite-(Ce)Hide

Formula:
(CaCe2.5Na0.5)(Al4)(Si2O7)(SiO4)3O(OH)2
IMA Formula:
(CaCe2.5Na0.5)(Al4)(Si2O7)(SiO4)3O(OH)2

Crystallography of Alnaperbøeite-(Ce)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 8.9110(4) Å, b = 5.6866(2) Å, c = 17.5252(7) Å
β = 116.475(5)°
Ratio:
a:b:c = 1.567 : 1 : 3.082
Unit Cell V:
796.13 ų

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
15.743(92)
4.616(30)
3.499(42)
2.983(100)
2.827(47)
2.751(32)
2.659(23)
2.619(57)
Comments:
From Type Description.

Type Occurrence of Alnaperbøeite-(Ce)Hide

General Appearance of Type Material:
In yttrian fluorite as gatelite-like crystals, some intimately inter-or overgrown by törnebohmite-(Ce)
Place of Conservation of Type Material:
Museo di Storia Naturale, Università degli Studi di Firenze, Firenze, Italy, catalogue number 3114/I
Geological Setting of Type Material:
quartz-microcline pegmatites of the niobium-yttrium-fluorine family
Associated Minerals at Type Locality:

Synonyms of Alnaperbøeite-(Ce)Hide

Relationship of Alnaperbøeite-(Ce) to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Perbøeite-(Ce)1 photo of Alnaperbøeite-(Ce) associated with Perbøeite-(Ce) on mindat.org.

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 Alnaperbøeite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bonazzi, P., Bindi, L., Chopin, C., Husdal, T.A. and Lepore, G.O. (2013) IMA 2012-054. CNMNC Newsletter No. 15, February 2013, page 4; Mineralogical Magazine, 77, 1-12.
Bonazzi, P., Lepore, G.O., Bindi, L.. Chopin, C., Husdal, T.A. & Medenbach, O. (2014): Perbøeite-(Ce) and alnaperbøeite-(Ce), two new members of the epidote-törnebohmite polysomatic series: Chemistry, structure, dehydrogenation, and clue for a sodian epidote end-member. American Mineralogist. 99, 157-169

Internet Links for Alnaperbøeite-(Ce)Hide

Localities for Alnaperbøeite-(Ce)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
Bonazzi, P., Bindi, L., Chopin, C., Husdal, T.A. and Lepore, G.O. (2013) IMA 2012-054. CNMNC Newsletter No. 15, February 2013, page 4; Mineralogical Magazine, 77, 1-12; Bonazzi, P., Lepore, G.O., Bindi, L.. Chopin, C., Husdal, T.A. & Medenbach, O. (2014): Perbøeite-(Ce) and alnaperbøeite-(Ce), two new members of the epidote-törnebohmite polysomatic series: Chemistry, structure, dehydrogenation, and clue for a sodian epidote end-member. American Mineralogist. 99, 157-169
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