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Name: |
natrolite |
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Class: |
Silicates |
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Chemistry: |
Na2Al2Si3O10 * 2H20 Hydrated sodium aluminum silicate (zeolite) |
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Color(s): |
white, yellowish,brown, reddish, colorless |
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Hardness: |
5 - 5.5 |
SpecGrav: |
2.2 - 2.3 |
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Fracture: |
conchoidal |
Cleavage: |
complete |
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Crystal: |
orthorhombic (prismatic, acicular, filamentary) |
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Envronment: |
lining cavities in basalts and other lavas, sometimes as an alteration product in syenites. Hydrothermal veins. |
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Association: |
benitoite,neptunite,calcite,apophyllite |
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Locals: |
Canada | India | Italy | Greenland | France | Ireland |New Jersey, Oregon, Calif./USA |
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Misc: |
Soluble in strong acids leaving silica gel, loses water at about 300 C. Sometimes fluoresces orange. The name comes from the Greek "natron", meaning that it contains sodium. |
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Photos |
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1.) Gopher Valley Quarry, Yamhill Co., Ore. |
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