Mica Hills pegmatites and prospects, Durham, Middlesex County, Connecticut, USAi
| Regional Level Types | |
|---|---|
| Mica Hills pegmatites and prospects | Pegmatite Field |
| Durham | - not defined - |
| Middlesex County | County |
| Connecticut | State |
| USA | Country |
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Latitude & Longitude (WGS84):
41° 26' 40'' North , 72° 40' 50'' West
Latitude & Longitude (decimal):
Locality type:
KΓΆppen climate type:
Multiple granite pegmatites intruded Collins Hill Formation east of Mica Hill Road and south and west of Cream Pot Road. Some are hundreds of feet long and form prominent ridges. There are at least a couple of small pegmatite prospects, one at the coordinates. Amazingly, there is no detailed geological mapping of this part of the Durham quadrangle. In general, the pegmatites have simple zoning, showing mostly anhedral albite/microcline/quartz intermediate zone with accessory muscovite. They appear to be very iron poor, with very little almandine, schorl or annite. Pure quartz core zones to about 2 m wide (a couple have been prospected) or very small (<1 m) pods are rare, but they can show euhedral microcline, muscovite, and very rarely beryl and almandine around their perimeters. The beryl crystals can be large, up to a few dm, but are typically not well formed. Apparently because of the low Fe content, they have little color, just a very pale yellow-green and thus can be hard to see.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| β Albite Formula: Na(AlSi3O8) Habit: anhedral Colour: white Description: pegmatite matrix Reference: Harold Moritz, Adam Berluti collections |
| β Almandine Formula: Fe2+3Al2(SiO4)3 Habit: trapezohedral Colour: maroon Description: A few crystals near quartz segregations. Reference: Harold Moritz, Adam Berluti collections |
| β Beryl Formula: Be3Al2(Si6O18) Habit: elongated prisms Colour: very pale green to yellow green, rarely yellow-orange Description: Found near the rare quartz core zones. Can be several dm in size, but generally poorly crystallized. Reference: Harold Moritz, Adam Berluti collections |
| β 'Columbite-(Fe)-Columbite-(Mn) Series' Description: Poorly developed specimens occasionally found as small crystals inside garnets Reference: Harold Moritz, Adam Berluti collections |
| β Fluorapatite Formula: Ca5(PO4)3F Description: Minor accessory in the pegmatites. Reference: Harold Moritz, Adam Berluti collections |
| β Microcline Formula: K(AlSi3O8) Habit: subhedral near quartz segregations. Colour: white Description: Part of the pegmatite matrix. Reference: Harold Moritz, Adam Berluti collections |
| β Muscovite Formula: KAl2(AlSi3O10)(OH)2 Description: Generally poorly crystallized. Reference: Harold Moritz, Adam Berluti collections |
| β Quartz Formula: SiO2 Habit: massive Colour: gray Description: Part of the pegmatite matrix. Rarely formed pure segregations or zones that host the most diverse and best crystallized mineralogy in these pegmatites. Reference: Harold Moritz, Adam Berluti collections |
| β Schorl Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) Description: Small crystals in the contact zone of the pegmatite and the country rock. Some schorls in the quartz core can be quite large (~10cm) and terminated Reference: Harold Moritz, Adam Berluti collections |
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| β | Quartz | 4.DA.05 | SiO2 |
| Group 8 - Phosphates, Arsenates and Vanadates | |||
| β | Fluorapatite | 8.BN.05 | Ca5(PO4)3F |
| Group 9 - Silicates | |||
| β | Albite | 9.FA.35 | Na(AlSi3O8) |
| β | Almandine | 9.AD.25 | Fe2+3Al2(SiO4)3 |
| β | Beryl | 9.CJ.05 | Be3Al2(Si6O18) |
| β | Microcline | 9.FA.30 | K(AlSi3O8) |
| β | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| β | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| Unclassified Minerals, Rocks, etc. | |||
| β | 'Columbite-(Fe)-Columbite-(Mn) Series' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| H | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| Be | Beryllium | |
| Be | β Beryl | Be3Al2(Si6O18) |
| B | Boron | |
| B | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | Oxygen | |
| O | β Almandine | Fe32+Al2(SiO4)3 |
| O | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | β Beryl | Be3Al2(Si6O18) |
| O | β Fluorapatite | Ca5(PO4)3F |
| O | β Quartz | SiO2 |
| O | β Microcline | K(AlSi3O8) |
| O | β Albite | Na(AlSi3O8) |
| F | Fluorine | |
| F | β Fluorapatite | Ca5(PO4)3F |
| Na | Sodium | |
| Na | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Na | β Albite | Na(AlSi3O8) |
| Al | Aluminium | |
| Al | β Almandine | Fe32+Al2(SiO4)3 |
| Al | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | β Beryl | Be3Al2(Si6O18) |
| Al | β Microcline | K(AlSi3O8) |
| Al | β Albite | Na(AlSi3O8) |
| Si | Silicon | |
| Si | β Almandine | Fe32+Al2(SiO4)3 |
| Si | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | β Beryl | Be3Al2(Si6O18) |
| Si | β Quartz | SiO2 |
| Si | β Microcline | K(AlSi3O8) |
| Si | β Albite | Na(AlSi3O8) |
| P | Phosphorus | |
| P | β Fluorapatite | Ca5(PO4)3F |
| K | Potassium | |
| K | β Muscovite | KAl2(AlSi3O10)(OH)2 |
| K | β Microcline | K(AlSi3O8) |
| Ca | Calcium | |
| Ca | β Fluorapatite | Ca5(PO4)3F |
| Fe | Iron | |
| Fe | β Almandine | Fe32+Al2(SiO4)3 |
| Fe | β Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Field observations Harold Moritz, Adam Berluti 2013-2015.
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Ganderia DomainDomain
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Mica Hills pegmatites and prospects, Durham, Middlesex County, Connecticut, USA