Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Quartz from
Rock Landing Quarry (Capt. Rohrback Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA


Locality type:Quarry
Classification
Species:Quartz
Formula:SiO2
Comments:Some very black, massive quartz is associated with meta-autunite.
Habit:massive
Colour:gray to black
Quality for species:Rock forming mineral/non-crystalline/little interest for collectors.(##)
Abundance at site:Extremely common
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Meta-autunite11
Albite11
Muscovite8
Beryl6
Columbite-(Fe)5
Fluorapatite4
Uraninite3
Thorite3
- var Thorogummite3
Microcline3
Metatorbernite2
Schorl2
Pyrite2
Almandine1
Uranophane1
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Rock Landing Quarry (Capt. Rohrback Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:37141
Long-form Identifier:1:3:37141:2
GUID (UUID V4):0
Nearest other occurrences of Quartz
0.8km (0.5 miles) ⓘKnudsen prospects, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
0.9km (0.6 miles) ⓘAnderson No. 2 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
0.9km (0.6 miles) ⓘAnderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
1.0km (0.6 miles) ⓘBailey prospect, East Hampton, Middlesex County, Connecticut, USA
1.0km (0.6 miles) ⓘFeldspar quarry, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
1.1km (0.7 miles) ⓘTidewater feldspar quarry, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
1.1km (0.7 miles) ⓘAmphibole-tourmaline-magnetite locality, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
1.4km (0.8 miles) ⓘEnegren Mica Mine, East Hampton, Middlesex County, Connecticut, USA
2.0km (1.2 miles) ⓘGillette Quarry (J-J Mine; Haddam Neck Quarry), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
2.1km (1.3 miles) ⓘHurd State Park quarries, East Hampton, Middlesex County, Connecticut, USA
References
Ingerson, Earl (1938) Uraninite and associated minerals from Haddam Neck, Connecticut. American Mineralogist, 23 (4) 269-276
 
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