Formula: Na(Mn,Ca)2Si3O8(OH)
Origin of name: for J. Serand, West African collector
Crystal system: triclinic
Crystal class: -1
Twinning: on{100} about [010] axis, contact or penetration, also on [110] contact
Unit cell: a = 7.71 Å, b = 6.89 Å, c = 6.74 Å, a = 90.3°, b = 94.2°, g = 77.3°
Colour: pink
Diaphaneity:
Luster: vitreous to greasy
Habit: crystals thick tabular or prismatic, aggregates of randomly intergrown crystals
Hardness: 4 to 5.5
Specific gravity: 3.215
Cleavage: 2; {001} and {100} perfect
Tenacity: brittle
Streak: white
Synonyms/varieties:
Comments: series with pectolite
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