Mineral Factbook

Tobermorite

Ca4Si6O17(H2O)2·(Ca·3H2O)IMA symbol: Tbmredefined

Tobermorite is a silicate mineral with the formula Ca4Si6O17(H2O)2·(Ca·3H2O), crystallizing in the orthorhombic system. It has a calculated density of 2.417 g/cm3. Its streak is white.

Photos

Tobermorite specimen photo
Lodewicus de Honsvels · CC BY-SA 4.0 · Commons
Tobermorite specimen photo
Leon Hupperichs · CC BY-SA 3.0 · Commons
Tobermorite specimen photo
Joan GarciaBadalona · CC BY-SA 4.0 · Commons
Tobermorite specimen photo
Dave Dyet http://www.shutterstone.com http://www.dyet.com · Public domain · Commons

Crystallography

Crystal systemorthorhombic crystal systemWikidata (CC0)
Space groupB 1 1 m
Cell (Å, °)a = 6.735, b = 7.385, c = 22.487; α = 90, β = 90, γ = 123.25
Cell volume935.351 ų, Z = 4
Axial ratios0.9120:1:3.0450calculated from COD 9005498
Source structureCOD 9005498 (European Journal of Mineralogy, 2001) — 1 of 7 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)11.2432.792.9783.0882.9785.464
I/I₀10020.119.919.819.719.5

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9005498; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)2.417 g/cm³calculated from COD 9005498
Streak
whitesingle sourceWikidata (CC0)

Classification

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