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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Chalcedony from
National Mine, Rockland, Ontonagon County, Michigan, USA


Locality type:Mine
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view National Mine, Rockland, Ontonagon County, Michigan, USA
Data Identifiers
Mindat Occurrence Record ID:417387
Long-form Identifier:1:3:417387:8
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
20.1km (12.5 miles) ⓘLake Superior beaches, Ontonagon, Ontonagon County, Michigan, USA
28.3km (17.6 miles) ⓘWhite Pine Mine, White Pine, Ontonagon County, Michigan, USA
30.7km (19.1 miles) ⓘGull Point, Ontonagon County, Michigan, USA
67.0km (41.6 miles) ⓘBlack River Harbor Beach, Black River Harbor, Gogebic County, Michigan, USA
78.4km (48.7 miles) ⓘNo. 21 shaft, Calumet & Hecla Mine, Calumet, Calumet Township, Houghton County, Michigan, USA
80.9km (50.3 miles) ⓘSt. Louis Mine Exploration, Schoolcraft Township, Houghton County, Michigan, USA
83.6km (52.0 miles) ⓘWolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA
83.8km (52.1 miles) ⓘWolverine No. 2 shaft, Wolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA
85.5km (53.1 miles) ⓘBlack Creek, Allouez Township, Keweenaw County, Michigan, USA
91.7km (57.0 miles) ⓘSeven Mile Point Beach, Seven Mile Point, Allouez Township, Keweenaw County, Michigan, USA
References
Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
 
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