Mineral Factbook

Larnite

Ca2(SiO4)IMA symbol: Lrngrandfathered

Larnite is a silicate mineral with the formula Ca2(SiO4), crystallizing in the monoclinic system. It has a Mohs hardness of 6, a calculated density of 3.314 g/cm3. Its streak is white.

Photos

Larnite specimen photo
Sharygin, Victor V. and Yakovlev, Grigory A. and Wirth, Richard and Seryotkin, Yurii V. and Sokol, Ellina V. and Nigmatulina, Elena N. and Karmanov, Nikolai S. and Pautov, Leonid A. · CC BY 4.0 · Commons
Larnite specimen photo
Reinhard Kraasch · CC BY-SA 4.0 · Commons
Larnite specimen photo
Reinhard Kraasch · CC BY-SA 4.0 · Commons
Larnite specimen photo
Victor V. Sharygin, Sergey N. Britvin, Felix V. Kaminsky, Richard Wirth, Elena N. Nigmatulina, Grigory A. Yakovlev, Konstantin A. Novoselov, and Mikhail N. Murashko · CC BY 4.0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupP 1 21/n 1
Cell (Å, °)a = 5.5051, b = 6.7551, c = 9.3108; α = 90, β = 94.513, γ = 90
Cell volume345.172 ų, Z = 4
Axial ratios0.8150:1:1.3783calculated from COD 9017424
Source structureCOD 9017424 (Crystallography Reports, 2011) — 1 of 7 structures

Powder X-ray diffraction (calculated)

2θ (degrees, Cu Kα1)I/I₀ (max 100)
d (Å)2.7912.7442.782.6092.1882.716
I/I₀1008979.867.354.332.5

xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9017424; idealized occupancies, no preferred orientation.

Physical properties

Density (calculated)3.314 g/cm³calculated from COD 9017424
Hardness (Mohs)
6single sourceWikidata (CC0)
Streak
whitesingle sourceWikidata (CC0)

Chemistry (calculated)

Molecular weight172.24 g/molcalculated from the IMA formula
Composition (wt%)Ca 46.54%, Si 16.31%, O 37.16%

Classification

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