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Analcime

Analcime is a silicate mineral prized by collectors for its exceptional color range, with notable Chinese occurrences.

Mohs 5–5.5
Vickers (~) 540 HV
Knoop (~) 620 HK
Geological setting
Volcanic
Element composition by mass

Formula: NaAlSi₂O₆·H₂O · molar mass: 220.15 g/mol

O 50.87%
Si 25.51%
Al 12.26%
Na 10.44%
H 0.92%

Computed from atomic weights (IUPAC 2021). Site-occupancy groups (Fe,Mn) split equally.

Mohs Hardness 5–5.5

Analcime sits at 5–5.5 on the Mohs scale — can be scratched by a steel knife.

Colors:
Streak
White
Crystal system
Isometric (Cubic)
SilicatesSilicates (Tectosilicates — Zeolites)
TL;DR · 1 min read
Analcime (NaAlSi₂O₆·H₂O) is a sodium zeolite forming distinctive trapezohedral (24-sided) crystals — one of the diagnostic "cube-like" zeolites. Named from Greek "analkis" (weak) for its pyroelectric properties.

Analcime (NaAlSi₂O₆·H₂O) is a sodium zeolite forming distinctive trapezohedral (24-sided) crystals — one of the diagnostic “cube-like” zeolites. Named from Greek “analkis” (weak) for its pyroelectric properties. Mt. Saint-Hilaire (Quebec) and Croft Quarry (England) yield iconic specimens. Forms in alkaline igneous rocks and basalt vesicles.

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