Prehnite
| Ca2Al(Si,Al)4O10(OH)2
This sample of prehnite is displayed in the Smithsonian Museum of Natural History. Prehnite is a silicate mineral with the composition Ca2Al(Si,Al)4O10(OH)2. The sample at left is about 8 cm across and is from Calvinia, Cape Province, South Africa.
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This sample of prehnite is from Bombay, Maharashtra, India. It is about 20 cm wide and is described as prehnite after laumontite.
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| This prehnite sample is about 15 cm across and is from Prospect Park, New Jersey. It is described as prehnite with calcite.
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This sample of prehnite is from Jeffrey mine, Asbestos, Quebec, Canada. It is about 18 cm wide.
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| This prehnite sample is about 10 cm across and is from Patterson, New Jersey. It is described as prehnite with calcite.
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This sample of prehnite is from Patterson New Jersey. It is about 20 cm wide.
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| This is about one quarter of the prehnite sample above that is about 40 cm across and is from Fairfax quarry, Centreville, Virginia. It is described as prehnite with fluorapophyllite.
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This sample of prehnite is from Jeffrey mine, Asbestos, Quebec, Canada. It is about 12 cm wide.
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| This large sample is from Khandivalli quarry, Bombay, Maharashtra, India. It is described as prehnite with gyrolite and fluorapophylite. It is probably about 25 x 40 cm.
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Mindat: Prehnite
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