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Calcite : CaCO3 | |
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Dracut, Middlesex Co., Massachusetts, USA Tabular calcite crystals with central zone of lighter color. Specimen about 1 1/4" wide. |
| © Paul Gilmore | Photo ID: 55128 View Count: 226 |
Calcite : CaCO3 | |
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Dracut, Middlesex Co., Massachusetts, USA Complex tabular crystals. Specimen is 3 1/2" wide. |
| © © Paul Gilmore | Photo ID: 79981 View Count: 136 |
Calcite : CaCO3 | |
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Dracut, Middlesex Co., Massachusetts, USA Hexagonal tabular calcite crystals in vug lined with stilbite on prehnite. Largest crystal is 1/2". |
| © © Paul Gilmore | Photo ID: 79980 View Count: 122 |
Calcite : CaCO3, Quartz : SiO2 | |
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Condon Quarry, Dracut, Middlesex Co., Massachusetts, USA 1/2" crystals of quartz coated with fine druzy calcite |
| © Paul Gilmore | Photo ID: 120406 View Count: 98 |
Calcite : CaCO3, Prehnite : Ca2Al2Si3O12(OH) | |
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Condon Quarry, Dracut, Middlesex Co., Massachusetts, USA 3 mm rhombs of colorless to honey-colored calcite on a matrix of coarse individual blades of pale green prehnite. |
| © Paul Gilmore | Photo ID: 133789 View Count: 91 |
Calcite : CaCO3, Dolomite : CaMg(CO3)2 | |
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Dracut, Middlesex Co., Massachusetts, USA Calcite crystals on a matrix of dolomite crystals, which are in turn sprinkled with tiny pyrite crystals. Scale at bottom is in millimeters. Dana Jewell collection. P. Cristofono photo. |
| © 2008 Peter Cristofono | Photo ID: 194674 View Count: 71 |
Heulandite, Prehnite : Ca2Al2Si3O12(OH) | |
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Dracut, Middlesex Co., Massachusetts, USA Heulandites sprinkled on knobs of yellowish prehnite, which grew over quartz crystal cores. Specimen about 3" across. |
| © Paul Gilmore | Photo ID: 53123 View Count: 228 |
Heulandite | |
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Condon Quarry, Dracut, Middlesex Co., Massachusetts, USA Dozens of 3 mm yellowish hexagonal heulandites. |
| © Paul Gilmore | Photo ID: 133788 View Count: 87 |
Prehnite : Ca2Al2Si3O12(OH) | |
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Dracut, Middlesex Co., Massachusetts, USA 2" wide chunk of calcite with clusters of prehnite blades, coated by pale blue secondary drusy prehnite. |
| © Paul Gilmore | Photo ID: 99073 View Count: 109 |
Prehnite : Ca2Al2Si3O12(OH) | |
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Dracut, Middlesex Co., Massachusetts, USA 2" wide plate of nearly colorless prehnite crystals. The green tint is mostly due to adherent clay. |
| © Paul Gilmore | Photo ID: 99074 View Count: 109 |
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