Mineral Factbook

Sugilite

KNa2Fe3+2(Li3Si12)O30IMA symbol: Sugapproved

Sugilite is a silicate mineral with the formula KNa2Fe3+2(Li3Si12)O30, crystallizing in the hexagonal system. It has a calculated density of 2.798 g/cm3. Its streak is white.

Photos

Sugilite specimen photo
Dguendel · CC BY 4.0 · Commons
Sugilite specimen photo
Beatrice Murch from Buenos Aires, Argentina · CC BY 2.0 · Commons
Sugilite specimen photo
TIS0421 · CC BY-SA 3.0 · Commons
Sugilite specimen photo
Myself (Adrian Pingstone). · Public domain · Commons

Crystallography

Crystal systemhexagonal crystal systemWikidata (CC0)
Space groupP 6/m c c
Cell (Å, °)a = 10.009, b = 10.009, c = 14.006; α = 90, β = 90, γ = 120
Cell volume1215.14 ų, Z = 2
Axial ratios1.0000:1:1.3993calculated from COD 9001134
Source structureCOD 9001134 (American Mineralogist, 1988) — 1 of 2 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)2.8694.3343.194.0722.5023.502
I/I₀10094.181.456.927.425.6

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9001134; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.798 g/cm³calculated from COD 9001134
Streak
whitesingle sourceWikidata (CC0)

Classification

Nickel-Strunz (10th)9.CM.05Wikidata (CC0)
Nickel-Strunz (9th)9.CM.05Wikidata (CC0)