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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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Bertrandite from
Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA


00556480017364664755044.jpg
Bertrandite, etc.

Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
00556480017364664755044.jpg
Bertrandite, etc.

Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
00030740017364664762133.jpg
Bertrandite, etc.

Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
Locality type:Quarry
Classification
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Fluorapatite1
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view Keyes Mica Quarries, Orange, Grafton County, New Hampshire, USA
Data Identifiers
Mindat Occurrence Record ID:653176
Long-form Identifier:1:3:653176:8
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
7.8km (4.8 miles) ⓘPalermo No. 1 Mine, Groton, Grafton County, New Hampshire, USA
11.9km (7.4 miles) ⓘFletcher Mine, Groton, Grafton County, New Hampshire, USA
12.0km (7.4 miles) ⓘRuggles Mine, Grafton, Grafton County, New Hampshire, USA
55.6km (34.6 miles) ⓘBald Mountain, Ossipee, Carroll County, New Hampshire, USA
63.6km (39.5 miles) ⓘBeryl Mountain Quarry, South Acworth, Acworth, Sullivan County, New Hampshire, USA
69.7km (43.3 miles) ⓘTurner Mine, Marlow, Cheshire County, New Hampshire, USA
71.5km (44.4 miles) ⓘGovernment pit, Albany, Carroll County, New Hampshire, USA
71.6km (44.5 miles) ⓘMiddle Moat Mountain locality, Hale's Location, Carroll County, New Hampshire, USA
74.3km (46.1 miles) ⓘIron Mountain Mines, Iron Mountain, Bartlett, Carroll County, New Hampshire, USA
74.5km (46.3 miles) ⓘBeauregard Mine, Alstead, Cheshire County, New Hampshire, USA
References
Smith, Arthur E. (2005) New Hampshire mineral locality index. Rocks & Minerals, 80 (4) 242-261 doi:10.3200/rmin.80.4.242-261
Thompson, Woodrow B., Falster, Alexander U., Mortimer, Thomas J. (2022) The Keyes Mica Mines, Orange, Grafton County, New Hampshire. Rocks & Minerals, 97 (4) 302-329 doi:10.1080/00357529.2022.2053622
 
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