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
Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA


07970320017272015661577.jpg
Heulandite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
09907780017272046188628.jpg
Heulandite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
05296580017272046206171.jpg
Heulandite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
07970320017272015661577.jpg
Heulandite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
01736730017272046234673.jpg
Heulandite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
08803340017272046239814.jpg
Heulandite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
07970320017272015661577.jpg
Heulandite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
09907780017272046188628.jpg
Heulandite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
05296580017272046206171.jpg
Heulandite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
Locality type:Island
Classification
Species:'Heulandite Subgroup' (not an IMA approved species)
Formula:(Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals Based on Photo Data:
Offretite4
Lévyne4
Smectite Group3
Data
Mineral Data:Click here to view Heulandite Subgroup data
Locality Data:Click here to view Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:975108
Long-form Identifier:1:3:975108:8
GUID (UUID V4):0
Nearest other occurrences of Heulandite Subgroup
1.3km (0.8 miles) ⓘSE Lava Drive, Milwaukie, Clackamas County, Oregon, USA
15.2km (9.4 miles) ⓘNew Era, Clackamas County, Oregon, USA
32.7km (20.3 miles) ⓘLivingston Quarry, Orchards, Clark County, Washington, USA
37.4km (23.3 miles) ⓘLacamas Creek, Orchards, Clark County, Washington, USA
46.0km (28.6 miles) ⓘEstacada Pyrite locality, Clackamas River localities, Estacada, Clackamas County, Oregon, USA
53.6km (33.3 miles) ⓘBig Tree Creek, Yacolt, Clark County, Washington, USA
62.3km (38.7 miles) ⓘRock Creek, Stevenson, Skamania County, Washington, USA
65.5km (40.7 miles) ⓘRoadcuts, Kalama area, Cowlitz County, Washington, USA
65.9km (40.9 miles) ⓘNisbet (Oregon Quicksilver), Oak Grove Fork, Clackamas County, Oregon, USA
66.7km (41.4 miles) ⓘGoble Quarry (Nicolai Quarry), Goble, Columbia County, Oregon, USA
References
(n.d.) Rudy Tschernich Zeolite Collection, Rice Museum.
 
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