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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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Stilbite Subgroup from
Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA


06060990017363709812991.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
00109480017272046309597.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
00829770017272046291502.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
09492020017272046307162.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
06060990017363709812991.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
07676540017374421374444.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
04383540017374421371482.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
02119730017374421381127.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
03694540017374421386781.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
00109480017272046309597.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
00829770017272046291502.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
09492020017272046307162.jpg
Stilbite Subgroup, etc.

Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
Locality type:Island
Classification
Species:'Stilbite Subgroup' (not an IMA approved species)
Formula:M6-7[Al8-9Si27-28O72] · nH2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Analcime4
Chabazite4
Smectite Group2
Native Copper1
Malachite1
Lévyne1
Offretite1
Data
Mineral Data:Click here to view Stilbite Subgroup data
Locality Data:Click here to view Elk Rock Island, Milwaukie, Clackamas County, Oregon, USA
Photo GalleryView Gallery (4 photos)
Data Identifiers
Mindat Occurrence Record ID:113708
Long-form Identifier:1:3:113708:8
GUID (UUID V4):0
Nearest other occurrences of Stilbite 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
26.6km (16.5 miles) ⓘLacamas Lake, Camas, Clark County, Washington, 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
52.6km (32.7 miles) ⓘWoodland, Clark County, Washington, 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) ⓘInterstate 5 Roadcuts, Roadcuts, Kalama area, Cowlitz County, Washington, USA
65.5km (40.7 miles) ⓘRoadcuts, Kalama area, Cowlitz County, Washington, USA
References
Micro Probe Volume VI Number 4
 
and/or  
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