Mineral Factbook

Coesite

SiO2IMA symbol: Coeapproved

Coesite is an oxide or hydroxide mineral with the formula SiO2, crystallizing in the monoclinic system. It has a calculated density of 2.919 g/cm3. Its streak is white.

Photos

Coesite specimen photo
Raimond Spekking · CC BY-SA 4.0 · Commons
Coesite specimen photo
J. Smyth. / Jasperox at en.wikipedia · CC BY-SA 1.0 · Commons
Coesite specimen photo
Materialscientist (talk) · CC BY-SA 3.0 · Commons
Coesite specimen photo
Hoa112008 (talk · contribs) · Public domain · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupC 1 2/c 1
Cell (Å, °)a = 7.14, b = 12.371, c = 7.175; α = 90, β = 120.34, γ = 90
Cell volume546.962 ų, Z = 16
Axial ratios0.5772:1:0.5800calculated from COD 9010143
Source structureCOD 9010143 (American Mineralogist, 2007) — 1 of 22 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)3.1053.0933.0963.0923.4213.427
I/I₀10099.88584.470.240.1

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9010143; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.919 g/cm³calculated from COD 9010143
Streak
whitesingle sourceWikidata (CC0)

Chemistry (calculated)

Molecular weight60.08 g/molcalculated from the IMA formula
Composition (wt%)Si 46.74%, O 53.26%

Classification

Nickel-Strunz (10th)4.DA.35Wikidata (CC0)
Nickel-Strunz (9th)4.DA.35Wikidata (CC0)
Dana (8th)75.1.4.1Wikidata (CC0)