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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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Malachite from
Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA


06901610017362197063914.jpg
Malachite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
06901610017362197063914.jpg
Malachite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
06293430017272038231730.jpg
Malachite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
Locality type:Pass
Classification
Species:Malachite
Formula:Cu2(CO3)(OH)2
Habit:asicular needles and rounded blebs
Colour:green
Abundance at site:Rare
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Calciohilairite
Quartz
Associated Minerals Based on Photo Data:
Linarite2
Chalcopyrite1
Galena1
Data
Mineral Data:Click here to view Malachite data
Locality Data:Click here to view Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
Data Identifiers
Mindat Occurrence Record ID:46424
Long-form Identifier:1:3:46424:4
GUID (UUID V4):0
Nearest other occurrences of Malachite
22.3km (13.8 miles) ⓘMolly Prospect, Mazama Mining District, Okanogan County, Washington, USA
22.3km (13.9 miles) ⓘMazama Porphyry, Mazama Mining District, Okanogan County, Washington, USA
24.1km (15.0 miles) ⓘGoat Mine, Slate Creek Mining District, Whatcom County, Washington, USA
25.7km (15.9 miles) ⓘNorth American Mine, Slate Creek Mining District, Whatcom County, Washington, USA
26.0km (16.1 miles) ⓘGolden Arrow Mine, Slate Creek Mining District, Whatcom County, Washington, USA
33.4km (20.8 miles) ⓘJohnsburg Mine, Cascade River, Cascade Mining District, Skagit County, Washington, USA
36.7km (22.8 miles) ⓘJones Prospect, Chewuch Mining District, Okanogan County, Washington, USA
37.7km (23.4 miles) ⓘHolden Mine, Railroad Creek Mining District, Chelan County, Washington, USA
38.1km (23.7 miles) ⓘBilly Goat Prospect, Chewuch Mining District, Okanogan County, Washington, USA
38.3km (23.8 miles) ⓘLead Horse Prospect, Chewuch Mining District, Okanogan County, Washington, USA
References
Micro Probe Volume VI Number 8
Rocks and Minerals, 66:6, p. 458
Boggs, Russell C. (1988) Calciohilairite: CaZrSi3O9·3H2O, the calcium analogue of hilairite from the Golden Horn batholith, northern Cascades, Washington. American Mineralogist, 73 (9-10) 1191-1194
 
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