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135 Fenn Road, Newington, Hartford Co., Connecticut, USA

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Latitude & Longitude (WGS84): 41° 42' 7'' North , 72° 45' 17'' West
Latitude & Longitude (decimal): 41.70194,-72.75472
GeoHash:G#: drkm0rtek
Locality type:Road
Köppen climate type:Dfa : Hot-summer humid continental climate

Light industrial facility that when constructed exposed fault veins in the basalt paralleling the west side of Fenn Road. Revealed the typical local hydrothermal suite of dolomite, barite, calcite, quartz, bitumen, sulfides, but noted for its excellent Herkimer-type quartz crystals typically sitting on beds of drusy quartz over altered basalt.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

3 valid minerals.

Detailed Mineral List:

Formula: α-Fe3+O(OH)
Habit: massive
Colour: dark brown
Description: Earthy alteration of siderite and coatings on fracture surfaces in fault veins.
Reference: Harold Moritz collection
Formula: SiO2
Habit: Herkimer-style stubby prismatic and drusy
Colour: colorless to milky
Description: Herkimer-style crystals to 3 cm commonly standing on a druse of much finer-grained quartz coating altered basalt matrix in fault veins.
Reference: Harold Moritz collection
Formula: FeCO3
Habit: flattened rhombs with curved edges
Colour: dark brown
Reference: Harold Moritz collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si

List of minerals for each chemical element

H Goethiteα-Fe3+O(OH)
C SideriteFeCO3
O Goethiteα-Fe3+O(OH)
O QuartzSiO2
O SideriteFeCO3
Si QuartzSiO2
Fe Goethiteα-Fe3+O(OH)
Fe SideriteFeCO3

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
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