Dollaseite-(Ce)

CaCe(Mg₂Al)[Si₂O₇][SiO₄]F(OH)IMA symbol: Dls-Ceredefined

Dollaseite-(Ce) is a silicate mineral with the formula CaCe(Mg2Al)[Si2O7][SiO4]F(OH), crystallizing in the monoclinic system. It has a calculated density of 3.923 g/cm3. Its streak is brown.

Photos

Dollaseite-(Ce) specimen photo — David Hospital · CC BY-SA 4.0 · Commons

Crystallography

Crystal system	monoclinic crystal systemWikidata (CC0)
Space group	P 1 21/m 1
Cell (Å, °)	a = 8.934, b = 5.721, c = 10.176; α = 90, β = 114.3, γ = 90
Cell volume	474.03 Å³, Z = 2
Axial ratios	1.5616:1:1.7787calculated from COD 9001164
Source structure	COD 9001164 (American Mineralogist, 1988)

Powder X-ray diffraction (calculated)

d (Å)	2.916	9.274	3.52	2.624	2.861	2.72
I/I₀	100	59.9	53.3	51	45.1	39.8

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9001164; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)	3.923 g/cm³calculated from COD 9001164
Streak	brownsingle sourceWikidata (CC0)

Chemistry (calculated)

Molecular weight	552.04 g/molcalculated from the IMA formula
Composition (wt%)	Ca 7.26%, Ce 25.38%, Mg 8.81%, Al 4.89%, Si 15.26%, O 34.78%, F 3.44%, H 0.18%

Classification

Nickel-Strunz (10th)	9.BG.05Wikidata (CC0)
Nickel-Strunz (9th)	9.BG.05cWikidata (CC0)
Dana (8th)	58.2.1a.6Wikidata (CC0)