Long Hill quartz locality, Haddam, Middlesex Co., Connecticut, USAi
|Regional Level Types|
|Long Hill quartz locality||- not defined -|
|Haddam||- not defined -|
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Latitude & Longitude (WGS84):
41° 27' 14'' North , 72° 30' 25'' West
Latitude & Longitude (decimal):
Köppen climate type:
The west side of Long Hill is host to a quartz crystal deposit where a fault apparently cross-cuts the thin layer of quartzite shown there on the bedrock map of the Haddam quadrangle. These crystals are similar in habit to those found at West Stafford and Moosup, Connecticut, where Mesozoic faults have brecciated quartzite.
It was known as far back as 1825 because it appears on the sketch map by Porter (1825). Williams (1899 and circa 1945) described the locality and crystals accurately: "On the west side of Longhill Quartz crystals can be dug by the bushel.", "in size they are from an inch to ten inches in length often aggregated laterally into groups."
Davis (1901) states: "well defined crystals of large size, translucent, and slightly discolored by oxide of iron, are found loose in the soil. Many of the smaller crystals are doubly terminated and perfectly transparent.
Location is very approximate.
Select Mineral List TypeStandard Detailed Strunz Dana Chemical Elements
Detailed Mineral List:
Habit: elongated 6-sided prisms with rhombohedral terminations. Larger crystals tend to be subparallel aggregates with myraid small terminations along the prism faces surrounding one dominant central termination.
Colour: clear to white
Reference: Williams (circa 1945 and 1899); Harold Moritz collection
List of minerals arranged by Strunz 10th Edition classification
|Group 4 - Oxides and Hydroxides|
List of minerals arranged by Dana 8th Edition classification
|Group 75 - TECTOSILICATES Si Tetrahedral Frameworks|
|Si Tetrahedral Frameworks - SiO2 with  coordinated Si|
Sort byYear (asc) Year (desc) Author (A-Z) Author (Z-A)
Porter, T. D. (1825), T. D. Porter's Localities of Minerals on Connecticut River. American Journal of Science series 1: 9: 177 and figure at end plate.
Williams, Horace S. (1899), Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut.
Davis, James W. (1901), The Minerals of Haddam, Connecticut Mineral Collector: 8(4): 50-54.
Davis, James W. (1901), The Minerals of Haddam, Connecticut Mineral Collector: 8(5): 65-70.
Williams, Horace S. (1945 [circa]), Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut.
Other Regions, Features and Areas containing this locality
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