Serandite

Formula: NaMn2+2Si3O8(OH)

Colour: Pale pink, salmon-red, salmon-orange, deep orange, rose-red, brown, colourless

Lustre: Vitreous, Sub-Vitreous, Greasy

Hardness: 5 – 5½

Specific Gravity: 3.34

Crystal System: Triclinic

Member of: Wollastonite Group

Name: Named in 1931 by Antoine François Alfred Lacroix after J.M. Serand, lighthouse keeper of the Island of Rouma, Los, who assisted collecting the mineral and who coincidentally had a rosey pink complexion.

Type Locality: Rouma Island, Los Archipelago (Los Islands), Conakry Region – Guinea

Part of serandite-schizolite-pectolite series.The manganese analogue of pectolite and the sodium analogue of tanohataite. Many of the lighter pink “serandites” are schizolite. They can’t be sorted visually. None of the deep orange serandites are schizolite.