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Topaz from
Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA

Locality type:Park
Classification
Species:Topaz
Formula:Al2(SiO4)(F,OH)2
Comments:A common, but locally variable component of the cross-cutting veins with quartz, fluorite, and muscovite, the latter commonly coating the crystals, even replacing them. Rarely gemmy. Crystals usually anhedral to subhedral prisms rarely terminated, up to 6 to 8 inches in diameter, with a length of 3 to 7 inches; micro crystals can be found that are transparent and show a great perfection of form and beauty. "Topaz is present in the quartz veins in quite unusual amount. The best locality is that described as the Limekiln Vein. This vein, which has been opened for a distance of some 75 feet, is from 1 to 5 feet wide. The vein originally consisted almost entirely of quartz and topaz, the quartz being considerably more abundant than the topaz...The topaz occurs in coarse crystalline masses of gray to pale yellow or white color, with well-defined cleavage, some of the cleavage surfaces being a foot in diameter. Most of the topaz contains veins and disseminated scales of margarodite, and large masses of margarodite contain cores of corroded and embayed topaz. Where the topaz abuts against small open cavities in the center of the vein it is bounded by rough crystal planes. Many of these cavities have been filled with coarse foliated margarodite not derived from the adjacent topaz crystals, as the surfaces of these crystals corroded." (Shannon, 1921b)
Habit:prismatic with square to rhombic section
Colour:colorless, white, grey, green, yellow-brown, blue
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Common
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
References
References:Hitchcock, Edward and Benjamin Silliman. (1826): Topaz. American Journal of Science: series 1: 10: 352-358.; Gurlt, Adolf. (1894): On a remarkable deposit of wolfram-ore in the United States. Transactions of the American Institute of Mining Engineers: 22: 236-242.; Hobbs, W. H. (1901): The old tungsten mine in Trumbull, Conn. USGS Annual Report 22:7-22.; Shannon, Earl V. (1921a): The Old Tungsten Mine in Trumbull, Connecticut. American Mineralogist 6:126-128.; Shannon, Earl V. (1921b), Some Minerals from the Old Tungsten Mine at Long Hill in Trumbull, Connecticut. Proceedings U.S. National Museum: 58(2348): 469-482.; Sullivan, Earle C. (1985): History and Minerals of Old Mine Park. Second Edition, Revised and Expanded. Trumbull Historical Society, Inc.; Januzzi, Ronald E. (1994): Mineral Data Book - Western Connecticut and Environs. Mineralogical Press, Danbury, Connecticut.
Associated Minerals Based on Photo Data:
Margarite3 photos of Topaz associated with Margarite at this locality.
Muscovite3 photos of Topaz associated with Muscovite at this locality.
Margarodite1 photo of Topaz associated with Margarodite at this locality.
Data
Mineral Data:Click here to view Topaz data
Locality Data:Click here to view Old Mine Park (Old Tungsten Mine), Long Hill, Trumbull, Fairfield County, Connecticut, USA
Photo GalleryView Gallery (21 photos)
Nearest other occurrences of Topaz
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) State Route 111 road cuts, Long Hill, Trumbull, Fairfield County, Connecticut, USA
1.4km (0.9 miles) Porter Hill Road roadcut, Long Hill, Trumbull, Fairfield County, Connecticut, USA
2.7km (1.6 miles) Poquonock River outcrops, Long Hill, Trumbull, Fairfield County, Connecticut, USA
5.1km (3.2 miles) Monroe, Fairfield County, Connecticut, USA
17.9km (11.1 miles) Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA
22.7km (14.1 miles) Ridgefield, Fairfield County, Connecticut, USA
58.1km (36.1 miles) Tollgate Quarry (Tollgate Mine; Bidwell Quarry; China-stone Quarry), Middletown, Middlesex Co., Connecticut, USA
60.0km (37.3 miles) White Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex Co., Connecticut, USA
 
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