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Mineralpedia Details for Catapleiite

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Catapleiite

Catapleiite

From the Greek words kata, meaning “at” or “with,” and pleios, meaning “majority” or “many,” as it is always found with other rare minerals. Catapleiite is an uncommon to rare mineral that occurs in syenites and nepheline syenites, and in pegmatite after the alteration of eudialyte. Localities for Catapleiite occur in Norway, the United States, Canada, Greenland, Sweden, Russia, and Guinea, among several others. Associated minerals include zircon, leucophanite, rinkite, eudialyte, epididymite, lavenite, astrophyllite, sodalite, natrolite, analcime, and aegirine.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/catapleiite.pdf

Formula
Na2ZrSi3O9·2H2
Crystal System
Monoclinic 
Crystal Habit
Platy, Pseudo Hexagonal 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous (Glassy) 
Color
blue, brown, colorless, yellow, yellow brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
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Mindat
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Catapleiite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Catapleiite
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Rosette of tan platy, pseudohexagonal crystals.

Pseudo-hexagonal, monoclinic crystal composite of several parallel crystals the largest to 4cm.

Honey yellow, thick tabular crystal 1.3cm wide.

Click thumbnail images for larger view.

Catapleiite from Langesundsfjorden, Larvik, Vestfold, Norway

Catapleiite
            from Langesundsfjorden, Larvik, Vestfold, Norway

Thin brown cleavages of Catapleiite to 3cm embedded in white Feldspar matrix.

Click thumbnail images for larger view.

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