Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
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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Heulandite Subgroup from
Nelson Creek, Stevenson, Skamania County, Washington, USA


Locality type:Creek
Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Nelson Creek, Stevenson, Skamania County, Washington, USA
Data Identifiers
Mindat Occurrence Record ID:602145
Long-form Identifier:1:3:602145:0
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
9.7km (6.0 miles) ⓘShellrock Mtn, Hood River County, Oregon, USA
10.9km (6.8 miles) ⓘRock Creek, Stevenson, Skamania County, Washington, USA
42.2km (26.2 miles) ⓘLivingston Quarry, Orchards, Clark County, Washington, USA
42.3km (26.3 miles) ⓘLacamas Creek, Orchards, Clark County, Washington, USA
43.5km (27.0 miles) ⓘBig Tree Creek, Yacolt, Clark County, Washington, USA
43.6km (27.1 miles) ⓘPucci drillhole, Hood River County, Oregon, USA
45.8km (28.5 miles) ⓘSwim Warm Springs, Clackamas County, Oregon, USA
53.5km (33.2 miles) ⓘQuartz Creek Roadcut, Lewis River, Skamania County, Washington, USA
56.1km (34.8 miles) ⓘPoison Creek, Lewis River, Skamania County, Washington, USA
61.6km (38.3 miles) ⓘEstacada Pyrite locality, Clackamas River localities, Estacada, Clackamas County, Oregon, USA
References
Mineralogical Magazine (1967) 36:64-69
 
and/or  
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