Muscovite from
Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA
| Locality type: | Park | |
| Classification | ||
|---|---|---|
| Species: | Muscovite | |
| Formula: | KAl2(AlSi3O10)(OH)2 | |
| Comments: | Abundant as a pure micaceous layer along the contacts of the topaz-fluorite-quartz veins with the amphibolite, reported as the hydrous variety "margarodite" by Shannon (1921b). However, this mica matches the physical properties of muscovite and was also identified by Raman spectroscopy. As flakes in the veins, and as coatings and replacement of topaz, also reported by Shannon (1921b) as "margarodite", but which is a mixture of muscovite and paragonite. Also an accessory in the pegmatites. "A foliated and radiated pearly mica from this locality has been widely distributed in old collections, labeled margarodite. This mica is very abundant in the limekiln vein, where it occurs as an alteration product of the topaz as aggregates of scales often grouped in spherical or fan-shaped bunches. In color the margarodite ranges from pale yellow to smoky brownish gray. The yellowish variety occurs replacing the large crystals of topaz. The grayish type is coarser and occurs in open spaces lined by topaz crystals and as narrow veins in which the crystals grow from either wall and inter¬lock loosely in the center of the vein, the space of which are filled with colorless to purple fluorite. Some of the coarsest of the mica is deep blue, apparently from thin layers of deep blue fluorite inserted between the laminae. The margarodite is in plates which uniformly show the structure found in commercial mica deposits and known as feathering evidently due to twinning. In appearance this twinning is more pearly than ordinary muscovite and laminae are more brittle...Mica of this foliated type occurs in practically all of the quartz veins of this vicinity, as seen especially in the main pit and in small openings along the tramway." (Shannon, 1921b). | |
| Habit: | anhedral tabular, fine-grained replacements of topaz | |
| Colour: | silvery | |
| Quality for species: | Poor for species, only of interest for locality collectors. (#) | |
| Abundance at site: | Extremely common | |
| Confirmation | ||
| Validity: | Confirmed | |
| Confirmation Methods: | Raman Spectroscopy | |
| Associated Minerals Based on Photo Data: | ||
| Topaz | ⓘ27 photos of Muscovite associated with Topaz at this locality. | |
| Quartz | ⓘ16 photos of Muscovite associated with Quartz at this locality. | |
| Margarite | ⓘ8 photos of Muscovite associated with Margarite at this locality. | |
| Fluorite | ⓘ4 photos of Muscovite associated with Fluorite at this locality. | |
| Clinochlore | ⓘ3 photos of Muscovite associated with Clinochlore at this locality. | |
| Chlorophane | ⓘ3 photos of Muscovite associated with Chlorophane at this locality. | |
| Goethite | ⓘ2 photos of Muscovite associated with Goethite at this locality. | |
| Fluorapatite | ⓘ2 photos of Muscovite associated with Fluorapatite at this locality. | |
| Ilmenite | ⓘ2 photos of Muscovite associated with Ilmenite at this locality. | |
| Marialite | ⓘ1 photo of Muscovite associated with Marialite at this locality. | |
| Data | ||
| Mineral Data: | Click here to view Muscovite data | |
| Locality Data: | Click here to view Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 131493 | |
| Long-form Identifier: | 1:3:131493:9 | |
| GUID (UUID V4): | b75b3ff7-7441-4e46-903c-7a63873b1013 | |
| Nearest other occurrences of Muscovite | ||
| 0.4km (0.2 miles) | ⓘOld Mine Plaza construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA | |
| 0.6km (0.4 miles) | ⓘCorporate Drive road cut, Long Hill, Trumbull, Fairfield County, Connecticut, USA | |
| 0.7km (0.4 miles) | ⓘCorporate Drive, Long Hill, Trumbull, Fairfield County, Connecticut, USA | |
| 0.8km (0.5 miles) | ⓘState Route 111 construction site, Long Hill, Trumbull, Fairfield County, Connecticut, USA | |
| 1.4km (0.9 miles) | ⓘPorter Hill Road roadcut, Long Hill, Trumbull, Fairfield County, Connecticut, USA | |
| 7.5km (4.7 miles) | ⓘNew England Materials quarry, Monroe, Fairfield County, Connecticut, USA | |
| 9.0km (5.6 miles) | ⓘThe Cascades, Fairfield, Fairfield County, Connecticut, USA | |
| 9.1km (5.7 miles) | ⓘEast Village pegmatite prospect, Monroe, Fairfield County, Connecticut, USA | |
| 11.0km (6.9 miles) | ⓘLittle Laurel Lime Park, Seymour, New Haven County, Connecticut, USA | |
| 11.4km (7.1 miles) | ⓘLord Chamberlain Nursing and Rehabilitation Center (7003 Main Street; 7003 State Route 110), Stratford, Fairfield County, Connecticut, USA | |
| References | ||
Old Mine Park, Long Hill, Trumbull, Fairfield County, Connecticut, USA