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Mineralpedia Details for Natrolite

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Natrolite

Natrolite

Named for the Greek for “sodium,” natrio, in reference to the mineral’s sodium content, and for “stone,” lithos. Natrolite is a common mineral that occurs in cavities in basalts and other igneous rocks as one of the last minerals to forms, and also occurs as a filling in seams in granites, gneisses, and syenites. Associated minerals include zeolites, calcite, nepheline, sodalite, and quartz. Natrolite hundreds of known localities including in Germany, France, England, Ireland, Norway, Russia, the United States, and Canada. Natrolite is pyroelectric and piezoelectric, and will generate a charge in response to temperature and pressure changes, respectively. It will commonly fluoresce an orange to yellow under ultraviolet light.

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

Formula
Na2(Si3Al2)O10·2H2
Crystal System
Orthorhombic 
Crystal Habit
Acicular, Prismatic, Nodular 
Cleavage
Perfect, Imperfect, None 
Luster
Vitreous - Silky 
Color
white, colorless, red, yellowish white, reddish white 
Streak
white 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness
5.5-6 
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Natrolite from Gratiot Mine, Keweenaw Co., Michigan, United States

Natrolite
            from Gratiot Mine, Keweenaw Co., Michigan, United States

Clear with tints of orange, bladed Natrolite crystals in fan-like sprays.

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Natrolite from Bergen Hill, Paterson, New Jersey, United States

Natrolite
            from Bergen Hill, Paterson, New Jersey, United States

Colorless prismatic crysals from 3-15mm showing good terminations.

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Natrolite from Somma-Vesuvius Complex, Naples, Campania, Italy

Natrolite
            from Somma-Vesuvius Complex, Naples, Campania, Italy

Creamy white prismatic crystals to 8mm in vug. Note the old tag in the prov. tab from the University of Amsterdam.

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Natrolite from Big Rock quarry, Little Rock, Pulaski Co., Arkansas, United States

Natrolite
            from Big Rock quarry, Little Rock, Pulaski Co., Arkansas, United States

Excellent for this mine with colorless Natrolite crystals to 1.5cm.

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