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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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Hummerite from
Blue Streak Mine, Montrose County, Colorado, USA


Locality type:Mine
Classification
Species:Hummerite
Formula:K2Mg2(V10O28) · 16H2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Pascoite1
Montroseite1
Hughesite1
Andersonite1
Corvusite1
Data
Mineral Data:Click here to view Hummerite data
Locality Data:Click here to view Blue Streak Mine, Montrose County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:934432
Long-form Identifier:1:3:934432:7
GUID (UUID V4):0
Nearest other occurrences of Hummerite
6.6km (4.1 miles) ⓘPeanut Mine, Bull Canyon, Montrose County, Colorado, USA
8.3km (5.2 miles) ⓘHummer Mine, Paradox Valley, Montrose County, Colorado, USA
14.2km (8.8 miles) ⓘWhitney Mine, Montrose County, Colorado, USA
24.0km (14.9 miles) ⓘNorth Star Mine (Atchinson Creek), Montrose County, Colorado, USA
26.1km (16.2 miles) ⓘVanadium Queen Mine, La Sal Creek Mining District, San Juan County, Utah, USA
50.7km (31.5 miles) ⓘHubbard Homestead Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA
52.5km (32.6 miles) ⓘLost Dutchman Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA
53.0km (32.9 miles) ⓘPackrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA
References
Kampf, A. R., Marty, J., Nash, B. P., Plášil, J., Kasatkin, A. V., Škoda, R. (2012) Calciodelrioite, Ca(VO3)2(H2O)4, the Ca analogue of delrioite, Sr(VO3)2(H2O)4. Mineralogical Magazine, 76 (7) 2803-2817 doi:10.1180/minmag.2012.076.7.12
Kampf, Anthony R., Hughes, John M., Marty, Joe, Nash, Barbara P., Chen, Yu-Sheng, Steele, Ian M. (2014) Bluestreakite, K4Mg2(V4+2V5+8O28)·14H2O, a new mixed-valence decavanadate mineral from the Blue Streak Mine, Montrose County, Colorado: crystal structure and descriptive mineralogy. The Canadian Mineralogist, 52 (6) 1007-1018 doi:10.3749/canmin.1400072
 
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