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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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Montebrasite from
Tamminen Quarry, Greenwood, Oxford County, Maine, USA


05169820017363852882657.jpg
Montebrasite

Tamminen Quarry, Greenwood, Oxford County, Maine, USA
05169820017363852882657.jpg
Montebrasite

Tamminen Quarry, Greenwood, Oxford County, Maine, USA
05169820017363852882657.jpg
Montebrasite

Tamminen Quarry, Greenwood, Oxford County, Maine, USA
Locality type:Quarry
Classification
Species:Montebrasite
Formula:LiAl(PO4)(OH)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Montebrasite data
Locality Data:Click here to view Tamminen Quarry, Greenwood, Oxford County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:28443
Long-form Identifier:1:3:28443:5
GUID (UUID V4):0
Nearest other occurrences of Montebrasite
0.8km (0.5 miles) ⓘMorgan Quarry (Morgan Pit; Upper Noyes Mountain Quarry; Upper Harvard Quarry), Greenwood, Oxford County, Maine, USA
0.8km (0.5 miles) ⓘNoyes Mountain Quarry (Harvard Quarry), Greenwood, Oxford County, Maine, USA
1.1km (0.7 miles) ⓘOutback prospect (Gross prospect), Greenwood, Oxford County, Maine, USA
6.2km (3.9 miles) ⓘEmmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
13.4km (8.3 miles) ⓘMount Mica Quarry, Paris, Oxford County, Maine, USA
13.9km (8.6 miles) ⓘRyerson Hill Quarries, Paris, Oxford County, Maine, USA
17.1km (10.6 miles) ⓘBennett Quarry, Buckfield, Oxford County, Maine, USA
18.5km (11.5 miles) ⓘMount Marie Quarries, Paris, Oxford County, Maine, USA
19.1km (11.9 miles) ⓘGE-SE Mine, Buckfield, Oxford County, Maine, USA
20.3km (12.6 miles) ⓘOwls Head prospects (Nevel prospects), Buckfield, Oxford County, Maine, USA
References
W. B. Thompson, D. L. Joyner, R. G. Woodman, and V. T. King (2005) A Collector's Guide to Maine Mineral Localities. Maine Geological Survey Bulletin 41
 
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