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
Groveland Mine, Randville, Dickinson County, Michigan, USA


06626290017727209905371.jpg
Schorl

Groveland Mine, Randville, Dickinson County, Michigan, USA
01892190017727209919165.jpg
Schorl

Groveland Mine, Randville, Dickinson County, Michigan, USA
08276520017272298606123.jpg
Schorl

Groveland Mine, Randville, Dickinson County, Michigan, USA
07816540017272053301566.jpg
Schorl

Groveland Mine, Randville, Dickinson County, Michigan, USA
08276520017272298606123.jpg
Schorl

Groveland Mine, Randville, Dickinson County, Michigan, USA
07816540017272053301566.jpg
Schorl

Groveland Mine, Randville, Dickinson County, Michigan, USA
Locality type:Mine
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Comments:Probably dravite-uvite
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Groveland Mine, Randville, Dickinson County, Michigan, USA
Data Identifiers
Mindat Occurrence Record ID:417803
Long-form Identifier:1:3:417803:3
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
4.5km (2.8 miles) ⓘSturgeon River Pegmatite Quarry, Dickinson County, Michigan, USA
12.1km (7.5 miles) ⓘFelch, Dickinson County, Michigan, USA
19.7km (12.2 miles) ⓘMillie Mine, Dickinson County, Michigan, USA
20.1km (12.5 miles) ⓘChapin Mine, Iron Mountain, Dickinson County, Michigan, USA
22.0km (13.6 miles) ⓘHorserace Rapids, Paint River, Mastodon Township, Iron County, Michigan, USA
23.8km (14.8 miles) ⓘWest Vulcan Mine, Vulcan, Dickinson County, Michigan, USA
26.3km (16.3 miles) ⓘSturgeon quartzite, Dickinson County, Michigan, USA
29.6km (18.4 miles) ⓘCrystal Falls, Iron County, Michigan, USA
31.5km (19.6 miles) ⓘPayant-Chrissman prospect (Florence County prospect), Aurora, Florence County, Wisconsin, USA
32.7km (20.3 miles) ⓘAnimikie Red Ace pegmatite, Pine River pegmatites, Fern, Florence County, Wisconsin, 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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