Mineral Information and Data:

Chabazite-Ca
Ca(Si4Al2)O12 • 6H2O [CNMNC approved formula]

Named as the calcium-dominant member of the chabazite series. Species name come from the Greek "chabazois," an ancient name of a stone. First published in 1792. Name changed from chabazite per nomenclature for zeolite minerals (IMA, 1997).

IMA status : Approved Species 1997 ()
CLASSIFICATION 
Dana
(8th edition) :
77.01.02.01  
  (77) Tectosilicate Zeolite group
  (77.01) true zeolites
  (77.01.02) Chabazite and related species
  
Nickel-Strunz
(10th edition) :
09.GD.10
  (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: Calcium-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
  
Synonyms/varieties: Cabasite, Phacolite (twinned var.), glottalite
Other Properties: Gemstone Extremely Rare.

 

Chabazite-Ca
Chabazite with stilbite
Origin: Wasson's Bluff, Parrsboro, Bay of Fundy, Cumberland Co., Nova Scotia, Canada
Sample size:4.5 x 2.5 x 5.5 cm
Photo: Dan Weinrich

 

Chabazite-Ca
(zoom-in of above)

 

Chabazite-Ca
A well crystallized of the "phacolite" variety of chabazite. Essentially these are colorless translucent twinned chabazite crystals to 6 mm in size.
Origin: Gads Hill, Tasmania, Australia
Sample size: 5.2 x 7.7 x 4.9 cm
Photo: Dan Weinrich

 

Chabazite-Ca
(zoom-in of above)

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