Abenakiite-(Ce)

Na₂₆Ce₆(Si₆O₁₈)(PO₄)₆(CO₃)₆(SO₂)OIMA symbol: Abk-Ceapproved

Abenakiite-(Ce) is a silicate mineral with the formula Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)O, crystallizing in the trigonal system. It has a calculated density of 3.33 g/cm3. Its streak is white.

Photos

Abenakiite-(Ce) specimen photo — Salah Rashad Zaqzoq · CC BY-SA 4.0 · Commons

Crystallography

Crystal system	trigonal crystal systemWikidata (CC0)
Space group	R -3 :H
Cell (Å, °)	a = 16.02, b = 16.02, c = 19.92; α = 90, β = 90, γ = 120
Cell volume	4427.36 Å³, Z = 3
Axial ratios	1.0000:1:1.2434calculated from COD 9004336
Source structure	COD 9004336 (The Canadian Mineralogist, 1994)

Powder X-ray diffraction (calculated)

d (Å)	2.697	2.67	6.551	3.172	3.795	1.897
I/I₀	100	80.5	65.2	55.2	47.5	46.5

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9004336; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)	3.33 g/cm³calculated from COD 9004336
Streak	whitesingle sourceWikidata (CC0)

Chemistry (calculated)

Molecular weight	2904.88 g/molcalculated from the IMA formula
Composition (wt%)	Na 20.58%, Ce 28.94%, Si 5.8%, O 34.7%, P 6.4%, C 2.48%, S 1.1%

Classification

Nickel-Strunz (10th)	9.CK.10Wikidata (CC0)
Nickel-Strunz (9th)	9.CK.10Wikidata (CC0)