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Albite-Anorthite Series | |
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Route 13 area, Lunenburg, Worcester Co., Massachusetts, USA Intermediate albite-anorthite series (plagioclase) crystals. View is 33 mm across. P. Cristofono specimen and photo, field collected 2005. |
| © 2005 Peter Cristofono | Photo ID: 39774 View Count: 491 |
Amphibole Group (Var: Uralite) | |
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Route 13 area, Lunenburg, Worcester Co., Massachusetts, USA 23 mm pseudomorph of tremolite-actinolite after diopside, doubly-terminated, in plagioclase. P. Cristofono specimen and photo. Field-collected 2006. |
| © 2006 Peter Cristofono | Photo ID: 58790 View Count: 321 |
Ankerite : Ca(Fe2+ ,Mg,Mn2+)(CO3)2 | |
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Keating Quarry, Lunenburg, Worcester Co., Massachusetts, USA View is about 25 mm across. (Not analyzed, may be ferroan dolomite.) P. Cristofono specimen and photo. |
| © 2006 Peter Cristofono | Photo ID: 64978 View Count: 221 |
Apatite-(CaF) : Ca5[F|(PO4)3] | |
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Route 13 area, Lunenburg, Worcester Co., Massachusetts, USA 5 mm blue crystal. Yellow fluorescence in SW UV. P. Cristofono specimen and photo. Field collected 2005. |
| © 2005 Peter Cristofono | Photo ID: 42016 View Count: 228 |
Apatite-(CaF) : Ca5[F|(PO4)3] | |
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Lunenburg, Worcester Co., Massachusetts, USA 4 mm greenish-blue crystal with quartz and actinolite. P. Cristofono specimen and photo. Field-collected 2006. |
| © 2006 Peter Cristofono | Photo ID: 53889 View Count: 155 |
Apatite-(CaF) : Ca5[F|(PO4)3] | |
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Lunenburg, Worcester Co., Massachusetts, USA 2.5 mm light green crystal in quartz. P. Cristofono specimen and photo. Field-collected 2006. |
| © 2006 Peter Cristofono | Photo ID: 53875 View Count: 143 |
Apatite-(CaF) : Ca5[F|(PO4)3] | |
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Route 13 area, Lunenburg, Worcester Co., Massachusetts, USA 3 mm greenish-blue crystal. Fluoresces orange in SW ultraviolet light. P. Cristofono specimen and photo. Field collected in 2006. |
| © 2008 Peter Cristofono | Photo ID: 51786 View Count: 129 |
Biotite | |
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Route 13 area, Lunenburg, Worcester Co., Massachusetts, USA 1 cm black crystal. P. Cristofono specimen and photo. Field collected 2005. |
| © 2005 Peter Cristofono | Photo ID: 43332 View Count: 233 |
Calcite : CaCO3, Quartz : SiO2 | |
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Lunenburg, Worcester Co., Massachusetts, USA A thick crust of druzy calcite covers quartz points to 1". At first I though I found prehnite because of the green color. Then, I thought the calcite was green because of environmental exposure that promoted algae growth, but this specimen was too freshly exposed for that. There is a rather sharp demarcation between the green and tan areas of ... |
| © Paul Gilmore | Photo ID: 82022 View Count: 174 |
Calcite : CaCO3, Quartz : SiO2 | |
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Lunenburg, Worcester Co., Massachusetts, USA Thick crust of druzy calcite over quartz points to 1". Some areas of the crust are green, others tan, and I don't know why. There is no underlying green mineral (such as prehnite). In the center of the specimen the shape of a large underlying quartz termination can be seen. Specimen is 6" wide. |
| © Paul Gilmore | Photo ID: 82038 View Count: 134 |
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