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
Easter-Duffy mineral occurrence, Easter Island Dike, Great Slave Lake, Northwest Territories, Canada


Locality type:Occurrence
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Easter-Duffy mineral occurrence, Easter Island Dike, Great Slave Lake, Northwest Territories, Canada
Data Identifiers
Mindat Occurrence Record ID:1982199
Long-form Identifier:1:3:1982199:1
GUID (UUID V4):0
Nearest other occurrences of Quartz
0.6km (0.4 miles) ⓘEaster Island Dike, Great Slave Lake, Northwest Territories, Canada
31.6km (19.6 miles) ⓘPhilmore Mine, Outpost Island, Great Slave Lake, Northwest Territories, Canada
33.1km (20.6 miles) ⓘUnnamed pegmatite, Philmore Mine, Outpost Island, Great Slave Lake, Northwest Territories, Canada
37.5km (23.3 miles) ⓘThor Lake syenite complex, Blachford Lake alkaline complex, Northwest Territories, Canada
42.0km (26.1 miles) ⓘBlachford Lake alkaline complex, Northwest Territories, Canada
43.1km (26.8 miles) ⓘHook Point, Yellowknife Pegmatite field, Northwest Territories, Canada
43.3km (26.9 miles) ⓘNechalacho deposit, Thor Lake syenite complex, Blachford Lake alkaline complex, North Slave Region, Northwest Territories, Canada
45.1km (28.0 miles) ⓘT-Zone deposit, Thor Lake syenite complex, Blachford Lake alkaline complex, North Slave Region, Northwest Territories, Canada
58.5km (36.4 miles) ⓘBlatchford Lake, Yellowknife Pegmatite field, Northwest Territories, Canada
60.3km (37.5 miles) ⓘMoose II pegmatite (ELK; Beck; DeStaffany), Yellowknife Pegmatite field, Northwest Territories, Canada
References
Graham, Cole; Locock, Andrew; Falck, Hendrik; Reynolds, Merilie; Canam, Rebecca; He, Qing; Rodríguez, Juan; Lecumberri-Sanchez, Pilar (2026) Mineralogy and geochemical controls on the Easter-Duffy five-element vein system, NWT, Canada. Ore Geology Reviews, 196. p.107451. doi:10.1016/j.oregeorev.2026.107451
 
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