Mineral Information and Data:

Na2Ca(Si8Al4)O24 • 12H2O [CNMNC approved formula]

Named as the sodium-dominant member of the chabazite series. Species name come from the Greek "chabazois," an ancient name of a stone. Named per nomenclature for zeolite minerals (IMA, 1997).

IMA status : Approved Species 1998 ()
(8th edition) :  (This Dana# Added)
  (77) Tectosilicate Zeolite group
  (77.01) true zeolites
  (77.01.02) Chabazite and related species
(10th edition) :
  (09) Silicates
  (09.G) Tektosilicates with Zeolitic H2O
  (09.GD) Chains of 6-membered rings - tabular zeolites
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Space group: P1
Unit cell: a = 9.425Å, b = 93.42Å, c = 9.42Å α = 94.25°, β = 94.2°, γ = 94.25°
Crystal Habit: Crystals simple rhombohedrons, resemble cubes, may be tabular; complex to rounded twinned forms; anhedral, granular, or massive
Twinning: About [0001], interpenetrant, simple and repeated, common; contact on {1011}
Color: Colorless, white, yellowish, pinkish, reddish white, greenish
Diaphaneity: Transparent, Translucent
Luster: Vitreous
Hardness (Mohs): 4 to 5
Measured Density: 2.05 to 2.16 g/cm3
Cleavage: Distinct/Good Distinct on {1011}
Tenacity: Brittle
Fracture: Uneven
Streak: White
Polymorphism and Series: Sodium-dominant member of the Chabazite series.
Geologic Setting: In volcanic rocks as basalts, andesite; rarer in limestones and schists; hydrothermally deposited in cavities and joints in ore veins. In bedded tuff in lake deposits, altered from volcanic glass.
Mineral Association: Zeolites, nepheline, melilite, olivine, pyroxenes, amphiboles, axinite, epidote, calcite, tridymite, dolomite
Other Properties: Gemstone Extremely Rare.


Clusters and druse of clear, colorless rhombohedral Chabazite-Na crystals.
Mineral identification confirmed by a single-crystal X-ray diffraction only.
Origin: Vaitape, Bora Bora, French Polynesia.
Photo: © RRUFF Project