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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Smectite Group from
Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA


Locality type:Island
Classification
Species:'Smectite Group' (not an IMA approved species)
Formula:A0.3D2-3[T4O10]Z2 · nH2O
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals Based on Photo Data:
Lévyne21
Offretite19
Heulandite Subgroup3
Erionite Subgroup2
Stilbite Subgroup2
Analcime1
Chabazite1
Data
Mineral Data:Click here to view Smectite Group data
Locality Data:Click here to view Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
Photo GalleryView Gallery (10 photos)
Data Identifiers
Mindat Occurrence Record ID:975109
Long-form Identifier:1:3:975109:5
GUID (UUID V4):0
Nearest other occurrences of Smectite Group
1.3km (0.8 miles) SE Lava Drive, Milwaukie, Clackamas County, Oregon, USA
15.2km (9.4 miles) New Era, Clackamas County, Oregon, USA
53.6km (33.3 miles) Big Tree Creek, Yacolt, Clark County, Washington, USA
64.7km (40.2 miles) Oak Grove Fork, Clackamas County, Oregon, USA
67.4km (41.9 miles) Neer Road, Goble, Columbia County, Oregon, USA
68.7km (42.7 miles) Nestucca River Quarry, Beaver, Tillamook County, Oregon, USA
73.6km (45.7 miles) Mc Gregor Quarry, Highway 26, Clatsop County, Oregon, USA
81.2km (50.5 miles) Carpathite occurrence, Cook, Skamania County, Washington, USA
84.8km (52.7 miles) Baird Creek Quarry, Wolf Point, Cowlitz County, Washington, USA
90.9km (56.5 miles) CTGH-1 well, Breitenbush-Austin Hot Springs area, Santiam Mining District (Elkhorn Mining District), Marion County, Oregon, USA
References
 
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