LPC UK-7
A material that is NOT an approved mineral species
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About LPC UK-7
Colour:
Black
Lustre:
Vitreous, Resinous
Specific Gravity:
3.80
Crystal System:
Monoclinic
An unnamed metamict phase, a Ca-REE-silicate found in the Tuften Quarry, Southern Norway, in a nepheline syenite pegmatite in the Larvik plutonic complex (LPC) and designated as "UK-7" by Andersen et al.. (1996) and Larsen et al.. (2010).
The metamict unknown phase was first found by the Norwegian collector Ingulv Burvald in 1985. It occurred in the nepheline syenite pegmatite as several centimeter large, euhedral crystals, often covered with a pale brownish powdery alteration crust of calcioancylite-(Ce).
First thought to be a possible member of the gadolinite group (Larsen et al.. 2010).
Malczewski et al.. (2018) investigated one sample of the unknown metamict phase by 57Fe Mössbauer spectroscopy, SEM-EDS analysis, gamma-ray spectrometry, and X-ray diffraction (XRD) and suggested that it is a new phase a rare earth silicate with a monoclinic structure resembling those of allanite-(Ce), ferriallanite-(Ce), chevkinite-(Ce) or perrierite-(Ce).
The studied sample was Th-bearing and characterized by 232Th and 238U activities of 136.6 Bq g–1 and 2.64 Bq g–1, respectively (Malczewski et al.. 2018).
The metamict unknown phase was first found by the Norwegian collector Ingulv Burvald in 1985. It occurred in the nepheline syenite pegmatite as several centimeter large, euhedral crystals, often covered with a pale brownish powdery alteration crust of calcioancylite-(Ce).
First thought to be a possible member of the gadolinite group (Larsen et al.. 2010).
Malczewski et al.. (2018) investigated one sample of the unknown metamict phase by 57Fe Mössbauer spectroscopy, SEM-EDS analysis, gamma-ray spectrometry, and X-ray diffraction (XRD) and suggested that it is a new phase a rare earth silicate with a monoclinic structure resembling those of allanite-(Ce), ferriallanite-(Ce), chevkinite-(Ce) or perrierite-(Ce).
The studied sample was Th-bearing and characterized by 232Th and 238U activities of 136.6 Bq g–1 and 2.64 Bq g–1, respectively (Malczewski et al.. 2018).
Unique Identifiers
Mindat ID:
53859
Long-form identifier:
mindat:1:1:53859:0
GUID
(UUID V4):
(UUID V4):
d31590ed-1031-4a3d-92c3-2da673b0a582
Physical Properties of LPC UK-7
Vitreous, Resinous
Colour:
Black
Tenacity:
Brittle
Density:
3.80 g/cm3 (Measured) 4.54 g/cm3 (Calculated)
Chemical Analysis
wt%
| 1 | |
|---|---|
| O | 27.9 % |
| Al | 5.4 % |
| Si | 9.3 % |
| Ca | 5.0 % |
| Ti | 0.5 % |
| Fe | 3.3 % |
| Ge | 0.5 % |
| Se | 1.2 % |
| Rb | 1.0 % |
| Y | 3.6 % |
| Te | 2.2 % |
| La | 2.8 % |
| Nd | 2.9 % |
| Ce | 11.9 % |
| Pr-Lu | 9.3 % |
| Ta | 1.6 % |
| W | 1.5 % |
| Pb | 4.7 % |
| Th | 3.36 % |
| U | 0.020 % |
| Total: | 97.98 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Tuften, Tvedalen, Larvik, Vestfold og Telemark, Norway | Malczewski, D., Dziurowicz, M., Kryzkawski, T and Grabias, A. (2018) Spectroscopic Characterization and Thermal Recrystallization Study of an Unknown Metamict Phase from Tuften Quarry, Southern Norway. Canadian Mineralogist. 56 (4): 365-373 | Scanning electronmicroscope with an energy dispersive X-ray spectrometer (SEM-EDS) |
Crystallography of LPC UK-7
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P2
Setting:
P1 2 1
Cell Parameters:
a = 8.179 Å, b = 14.16 Å, c = 4.291 Å
β = 96.71°
β = 96.71°
Ratio:
a:b:c = 0.578 : 1 : 0.303
Unit Cell V:
493.56 ų (Calculated from Unit Cell)
Comment:
On a recrystallized metamict sample, annealed in argon for one hour at 1273 K
Common Associates
Associated Minerals Based on Photo Data:
| 2 photos of LPC UK-7 associated with Calcioancylite-(Ce) | (Ce,Ca,Sr)CO3(OH,H2O) |
| 1 photo of LPC UK-7 associated with Fluorite | CaF2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for LPC UK-7
mindat.org URL:
https://www.mindat.org/min-53859.html
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References for LPC UK-7
Reference List:
Localities for LPC UK-7
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Norway | |
|
Tuften, Tvedalen, Larvik, Vestfold og Telemark, Norway