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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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Muscovite from
Megiliggar Rocks (Tremearne pegmatite), Breage, Cornwall, England, UK


03891780017365970037633.jpg
Muscovite

Megiliggar Rocks, Breage, Cornwall, England, UK
03891780017365970037633.jpg
Muscovite

Megiliggar Rocks, Breage, Cornwall, England, UK
04031270017365970043634.jpg
Muscovite

Megiliggar Rocks, Breage, Cornwall, England, UK
Locality type:Outcrop
Classification
Species:Muscovite
Formula:KAl2(AlSi3O10)(OH)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Schorl3
Orthoclase3
Quartz3
Fluorapatite2
Data
Mineral Data:Click here to view Muscovite data
Locality Data:Click here to view Megiliggar Rocks (Tremearne pegmatite), Breage, Cornwall, England, UK
Data Identifiers
Mindat Occurrence Record ID:985109
Long-form Identifier:1:3:985109:2
GUID (UUID V4):0
Nearest other occurrences of Muscovite
2.9km (1.8 miles) ⓘGreat Wheal Fortune, Breage, Cornwall, England, UK
3.4km (2.1 miles) ⓘTregonning Hill, Breage, Cornwall, England, UK
5.6km (3.5 miles) ⓘCroft Gothal Mine, St Hilary, Cornwall, England, UK
7.7km (4.8 miles) ⓘPenberthy Croft Mine, St Hilary, Cornwall, England, UK
10.4km (6.5 miles) ⓘSouth Wendron Mine (South Wheal Lovell; Lovell Consols), Trewennack, Wendron, Cornwall, England, UK
10.6km (6.6 miles) ⓘBassett & Grylls Mine (Porkellis Mine; Porkellis Tin Mines; Wheal Jantar; Balwath Mine), Porkellis, Wendron, Cornwall, England, UK
10.8km (6.7 miles) ⓘFatwork Mine, East Wheal Lovell (incl. Tregonebris Mine), Trewennack, Wendron, Cornwall, England, UK
12.4km (7.7 miles) ⓘBalmynheer Mine, Porkellis, Wendron, Cornwall, England, UK
13.0km (8.1 miles) ⓘTrencrom Hill, Trencrom, Ludgvan, Cornwall, England, UK
13.9km (8.6 miles) ⓘSouth Wheal Providence (South Wheal Speed), Carbis Bay, St Ives, Cornwall, England, UK
References
Haas, Peter (n.d.) Personal communication.
 
and/or  
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