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Rowlandite-(Y)
- Y4FeSi4O14F2
- (Y,Ce)4FeSi4O14F2
- [Y3+4][Fe2+][F2|(Si2O7)2]14-
- Color: Pale gree, Gray
- Tarnish: Brownish red, Waxy luster
- Streak: White
- Luster: Vitreous
- Diaphaneity: Transparent
- Cleavage: No
- Hardness: 5.5-6.5
- Density: 4.3
- System: Triclinic
- Lattice: a=6.6, b=8.7, c=5.5, α=99.0, β=104.1, γ=91.5