Magnesiorowlandite-(Y)
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Formula:
Y4(Mg,Fe)(Si2O7)2F2
Colour:
Gray to white
Lustre:
Vitreous, Greasy
Hardness:
5 - 5½
Specific Gravity:
4.82 (Calculated)
Crystal System:
Triclinic
Name:
Name after its relation with rowlandite-(Y).
Classification of Magnesiorowlandite-(Y)
Approved
Approval year:
2012
Physical Properties of Magnesiorowlandite-(Y)
Vitreous, Greasy
Transparency:
Transparent
Comment:
Vitrous to oily lustre
Colour:
Gray to white
Streak:
White
Hardness:
5 - 5½ on Mohs scale
Cleavage:
None Observed
Density:
4.82 g/cm3 (Calculated)
Optical Data of Magnesiorowlandite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.755(5) nγ = 1.760(5)
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Max Birefringence:
δ = 0.005

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Comments:
With pleochroism
Chemical Properties of Magnesiorowlandite-(Y)
Formula:
Y4(Mg,Fe)(Si2O7)2F2
Crystallography of Magnesiorowlandite-(Y)
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 6.527(6) Å, b = 8.656(9) Å, c = 5.519(5) Å
α = 99.09(8)°, β = 104.17(7)°, γ = 91.48(8)°
α = 99.09(8)°, β = 104.17(7)°, γ = 91.48(8)°
Ratio:
a:b:c = 0.754 : 1 : 0.638
Unit Cell V:
297.9 ų
Z:
1
Morphology:
Non–metamict aggregates
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.95 Å | (33) |
3.64 Å | (37) |
3.54 Å | (38) |
3.08 Å | (100) |
2.92 Å | (26) |
2.68 Å | (32) |
2.63 Å | (28) |
2.09 Å | (35) |
Type Occurrence of Magnesiorowlandite-(Y)
General Appearance of Type Material:
Aggregates up to 1 cm in composed of gray massive and white powdery parts.
Place of Conservation of Type Material:
National Museum of Nature and Science, Tokyo, registered number NSM-M43624
Geological Setting of Type Material:
granite pegmatite
Associated Minerals at Type Locality:
Synonyms of Magnesiorowlandite-(Y)
Other Language Names for Magnesiorowlandite-(Y)
Japanese:苦土ローランド石
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.
References for Magnesiorowlandite-(Y)
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Matsubara, S., Miyawaki, R., Yokoyama, K., Shigeoka, M., Momma, K. and Yamamoto, S. (2012) Magnesiorowlandite-(Y), IMA 2012-010. CNMNC Newsletter No. 13, June 2012, page 815; Mineralogical Magazine, 76, 807?-817.
Matsubara, S., Miyawaki, R., Yokoyama, K., Shigeoka, M., Momma, K., Yamamoto, S. (2014): Magnesiorowlandite-(Y), Y4Mg(Si2O7)2F2, a new mineral in a pegmatite at Souri Valley, Komono, Mie Prefecture, central Japan. Journal of Mineralogical and Petrological Sciences, 109, 109-117.
Internet Links for Magnesiorowlandite-(Y)
mindat.org URL:
https://www.mindat.org/min-42701.html
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Localities for Magnesiorowlandite-(Y)
Locality List




All localities listed without proper references should be considered as questionable.
Japan (TL) | |
| Matsubara, S., et al (2011) Abstracts of the 136th Meeting, Mineral Sciences Japan, 2011-09-05; Matsubara, S., Miyawaki, R., Yokoyama, K., Shigeoka, M., Momma, K., Yamamoto, S. (2014): Magnesiorowlandite-(Y), Y4Mg(Si2O7)2F2, a new mineral in a pegmatite at Souri Valley, Komono, Mie Prefecture, central Japan. Journal of Mineralogical and Petrological Sciences, 109, 109-117. |
Norway | |
| Husdal, T., Müller, A. Olerud, S, & Thorsen, Ø. (2017) Pegmatites of the Tysfjord-Hamarøy area, northern Norway. in Müller et. al. (2017) Norwegian pegmatites ! Tysfjord-Hamarøy, Evje-Iveland, Langesundsfjord. Geological society of Norway Geological Guides 6-2017: 3-47. |
Sweden | |
| Holtstam, D. & Andersson, U.B. (2007): The REE minerals of the Bastnäs-type deposits, South-Central Sweden. Canadian Mineralogist: 45: 1073-1114 |