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Thomsonite
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Thomsonite is the name of a series of tecto-silicate minerals of the zeolite group. Prior to 1997, thomsonite was recognized as a mineral species, but a reclassification in 1997 by the International ... Wikipedia
Hardness: 5 to 5.5
Color: colorless, white, beige, and pink
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
Crystal system: Orthorhombic
Formula (repeating unit): NaCa2Al5Si5O20·6H2O
Luster: vitreous, pearly
Streak: white