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Prehnite : Ca2Al2Si3O12(OH) | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA Prehnite epimorphs after anhydrite, with minor datolite. S413-018 #1246# 9 cm field of view, vertical. |
| © 2008, JGW | Photo ID: 149585 View Count: 82 |
Prehnite : Ca2Al2Si3O12(OH) | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA Large, conical clusters up to 2 cm across of translucent green prehnite. Distinct crystals of prehnite are rare - this specimen has large lustrous crystals with no damage. From an old locality that was seldom collected. Overall size of mineral specimen: 9x6x3 cm. Size of individual crystals: 5-10 mm. |
| © 2002 John H. Betts | Photo ID: 4696 View Count: 413 |
Prehnite : Ca2Al2Si3O12(OH) | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA Lustrous, apple green chunk, about 1 3/4" across. |
| © Paul Gilmore | Photo ID: 54694 View Count: 233 |
Prehnite : Ca2Al2Si3O12(OH) | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA 3" wide group of lustrous green prehnite on blocky white calcite |
| © Paul Gilmore | Photo ID: 118896 View Count: 87 |
Prehnite : Ca2Al2Si3O12(OH) | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA This chunk of prehnite was originally so rust stained that I soaked it hydrochloric acid. It did a good job, but also caused a predictable blurring of the individual prehnite blades, giving it this frosted appearance. There is almost no luster, but it's still kind of cool. At least it's green. Paul Gilmore specimen and photo. |
| © Paul Gilmore | Photo ID: 51940 View Count: 259 |
Prehnite : Ca2Al2Si3O12(OH) | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA Prehnite ball, 3/4" across, with smaller crytals of same perched on top. |
| © Paul Gilmore | Photo ID: 54695 View Count: 197 |
Prehnite : Ca2Al2Si3O12(OH), Babingtonite : Ca2(Fe,Mn)FeSi5O14(OH) | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA Specimen of green prehnite on black babingtonite blades, 3/4" wide. Babingtonites this large are rare, but have been found at a several localities in the Conecticut River Valley. |
| © Paul Gilmore | Photo ID: 105488 View Count: 138 |
Prehnite : Ca2Al2Si3O12(OH) | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA 1/4" prehnite stained a little yellow by limonite. |
| © Paul Gilmore | Photo ID: 100431 View Count: 102 |
Prehnite : Ca2Al2Si3O12(OH), Calcite : CaCO3 | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA 5mm aggregates of apple green prehnite on druzy calcite. |
| © Paul Gilmore | Photo ID: 97907 View Count: 101 |
Prehnite : Ca2Al2Si3O12(OH), Babingtonite : Ca2(Fe,Mn)FeSi5O14(OH) | |
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Roncari quarry (Tilcon quarry), East Granby, Hartford Co., Connecticut, USA 1.5" group. |
| © Paul Gilmore | Photo ID: 104848 View Count: 89 |
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