Mineral Information and Data:

Catapleiite
Na2ZrSi3O9 • 2H2O [CNMNC approved formula]

Named from the Greek for "wholly' and "full", because it is always accompanied by a number of rare minerals.

IMA status : Valid species (Pre-IMA 1850) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
59.02.02.01  
  (59) Cyclosilicate Three-Membered Rings
  (59.02) hydrated
  (59.02.02) Catapleiite group
  
Nickel-Strunz
(10th edition) :
09.CA.15
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CA) [Si3O9]6- 3-membered single rings (dreier-Einfachringe), without insular complex anions
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: I2/c
Unit cell: a = 12.799Å, b = 7.419Å, c = 20.157Å β = 90.41°
Crystal Habit: Crystals pseudohexagonal, thin tabular on {001}, to 15 cm; as rosettes of crystal plates.
Twinning: Polysynthetically twinned at 30°, 60°, and 90°.
  
Color: Colorless, white, light yellow to yellowish brown, pale brown, grayish blue, violet; colorless in thin section.
Diaphaneity: Transparent, translucent to opaque.
Luster: Weakly vitreous or dull.
Hardness (Mohs): 5.5 - 6
Measured Density: 2.65 - 2.9 g/cm3
Cleavage: {100}, perfect; {101} and {102}, imperfect
Tenacity: Brittle
Fracture: Conchoidal
Streak: White to pale yellow.
  
Polymorphism and Series: Dimorphous with gaidonnayite; forms a series with calcium catapleiite.
Geologic Setting: In syenites and nepheline syenites; in pegmatites, typically the result of metasomatic alteration of eudialyte.
Mineral Association: Zircon, leucophanite, rinkite, eudialyte, epididymite, lavenite, astrophyllite, sodalite, natrolite, analcime, aegirine
  
Other Properties: Gemstone Extremely Rare.

 

Catapleiite
Origin: Mt. St. Hilaire, Quebec, Canada
Sample size: 3.6 x 2.1 x 0.4 cm
Photo: Rob Lavinsky

 

Catapleiite
(zoom-in of above)

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