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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
Long Hill prospects (Turkey Hill prospects), Haddam, Middlesex County, Connecticut, USA


Locality type:Prospect
Classification
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view Long Hill prospects (Turkey Hill prospects), Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:657201
Long-form Identifier:1:3:657201:3
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
0.5km (0.3 miles) ⓘHewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry), Haddam, Middlesex County, Connecticut, USA
1.9km (1.2 miles) ⓘState Route 9 Interchange 13 - Beaver Meadow Road, Haddam, Middlesex County, Connecticut, USA
3.5km (2.2 miles) ⓘConnecticut Yankee atomic power plant, Haddam Neck, Haddam, Middlesex County, Connecticut, USA
4.2km (2.6 miles) ⓘQuarry Hill (Brainerd Quarries; Shailor Quarries), Haddam Neck, Haddam, Middlesex County, Connecticut, USA
7.4km (4.6 miles) ⓘAnderson No. 1 Mica Mine, East Hampton, Middlesex County, Connecticut, USA
8.9km (5.6 miles) ⓘWorth and Selden Quarries (Victoria Quarry), East Hampton, Middlesex County, Connecticut, USA
9.5km (5.9 miles) ⓘSlocum prospect, East Hampton, Middlesex County, Connecticut, USA
12.6km (7.8 miles) ⓘTollgate Quarry (Tollgate Mine; Bidwell Quarry; China-stone Quarry), Middletown, Middlesex County, Connecticut, USA
13.9km (8.6 miles) ⓘWhite Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
14.3km (8.9 miles) ⓘState Forest Quarry No. 2, Cobalt, East Hampton, Middlesex County, Connecticut, USA
References
Henderson, William A., Jr. (1975) The Bertrandites of Connecticut. The Mineralogical Record, 6 (3) Tucson, Arizona. 114-123
 
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