Mineral Factbook

Richterite

Na(NaCa)Mg5Si8O22(OH)2IMA symbol: Rctredefined

Richterite is a silicate mineral with the formula Na(NaCa)Mg5Si8O22(OH)2, crystallizing in the monoclinic system. It has a calculated density of 2.997 g/cm3.

Photos

Richterite specimen photo
Shannon Heinle · CC0 · Commons
Richterite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons
Richterite specimen photo
John Sobolewski (JSS) · CC BY 3.0 · Commons
Richterite specimen photo
Robert M. Lavinsky · CC BY-SA 3.0 · Commons

Crystallography

Crystal systemmonoclinic crystal systemWikidata (CC0)
Space groupC 1 2/m 1
Cell (Å, °)a = 10.0439, b = 17.9883, c = 5.2708; α = 90, β = 104.803, γ = 90
Cell volume920.683 ų, Z = 2
Axial ratios0.5584:1:0.2930calculated from COD 9003693
Source structureCOD 9003693 (American Mineralogist, 2005) — 1 of 70 structures

Physical properties

Density (calculated)2.997 g/cm³calculated from COD 9003693

Chemistry (calculated)

Molecular weight818.27 g/molcalculated from the IMA formula
Composition (wt%)Na 5.62%, Ca 4.9%, Mg 14.85%, Si 27.46%, O 46.93%, H 0.25%

Classification

Nickel-Strunz (10th)9.DE.20Wikidata (CC0)
Nickel-Strunz (9th)9.DE.20Wikidata (CC0)