Charoite

(K,Sr,Ba,Mn)₁₅-₁₆(Ca,Na)₃₂[Si₇₀(O,OH)₁₈₀] (OH,F)₄·nH₂OIMA symbol: Chaapproved

Charoite is a silicate mineral with the formula (K,Sr,Ba,Mn)15-16(Ca,Na)32[Si70(O,OH)180] (OH,F)4·nH2O. It has a calculated density of 2.435 g/cm3. Its streak is white.

Photos

Crystallography

Space group	P 1 21/m 1
Cell (Å, °)	a = 32.11, b = 19.77, c = 7.23; α = 90, β = 95.85, γ = 90
Cell volume	4565.81 Å³, Z = 2
Axial ratios	1.6242:1:0.3657calculated from COD 9015238
Source structure	COD 9015238 (Mineralogical Magazine, 2011) — 1 of 2 structures

Powder X-ray diffraction (calculated)

d (Å)	12.424	16.811	3.362	1.807	9.374	9.885
I/I₀	100	79.2	25.6	25	24.9	24.6

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9015238; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)	2.435 g/cm³calculated from COD 9015238
Streak	whitesingle sourceWikidata (CC0)

Classification

Nickel-Strunz (10th)	9.DG.92Wikidata (CC0)
Nickel-Strunz (9th)	9.DG.92Wikidata (CC0)