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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Tourmaline from
Stambaugh formation, Iron River, Iron County, Michigan, USA


Locality type:Formation
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Stambaugh formation, Iron River, Iron County, Michigan, USA
Data Identifiers
Mindat Occurrence Record ID:417807
Long-form Identifier:1:3:417807:1
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
22.1km (13.7 miles) ⓘCrystal Falls, Iron County, Michigan, USA
29.2km (18.2 miles) ⓘHorserace Rapids, Paint River, Mastodon Township, Iron County, Michigan, USA
33.2km (20.6 miles) ⓘAnimikie Red Ace pegmatite, Pine River pegmatites, Fern, Florence County, Wisconsin, USA
46.1km (28.6 miles) ⓘSturgeon River Pegmatite Quarry, Dickinson County, Michigan, USA
47.8km (29.7 miles) ⓘSturgeon quartzite, Dickinson County, Michigan, USA
50.3km (31.3 miles) ⓘGroveland Mine, Randville, Dickinson County, Michigan, USA
51.9km (32.3 miles) ⓘChapin Mine, Iron Mountain, Dickinson County, Michigan, USA
52.6km (32.7 miles) ⓘMillie Mine, Dickinson County, Michigan, USA
54.7km (34.0 miles) ⓘPayant-Chrissman prospect (Florence County prospect), Aurora, Florence County, Wisconsin, USA
57.9km (36.0 miles) ⓘMagnetic Mine, Republic, Republic Township, Marquette 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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