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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Opal from
Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA


00011520017272728657659.jpg
Opal, etc.

Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
07436820017272016259714.jpg
Opal, etc.

Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
02131670017272016243088.jpg
Opal, etc.

Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
04065670017272019512260.jpg
Opal, etc.

Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
07436820017272016259714.jpg
Opal, etc.

Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
02131670017272016243088.jpg
Opal, etc.

Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
04065670017272019512260.jpg
Opal, etc.

Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
07436820017272016259714.jpg
Opal, etc.

Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
02131670017272016243088.jpg
Opal, etc.

Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
Locality type:Road Cutting
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Associated Minerals Based on Photo Data:
Siderite5
Gypsum1
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Memaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:710576
Long-form Identifier:1:3:710576:0
GUID (UUID V4):0
Nearest other occurrences of Opal
22.3km (13.9 miles) ⓘNisbet (Oregon Quicksilver), Oak Grove Fork, Clackamas County, Oregon, USA
22.6km (14.1 miles) ⓘKiggins Mine, Oak Grove Fork, Clackamas County, Oregon, USA
41.6km (25.9 miles) ⓘPucci drillhole, Hood River County, Oregon, USA
50.8km (31.6 miles) ⓘCinnabar Occurrence, Breitenbush-Austin Hot Springs area, Santiam Mining District (Elkhorn Mining District), Marion County, Oregon, USA
55.7km (34.6 miles) ⓘLivingston Quarry, Orchards, Clark County, Washington, USA
70.8km (44.0 miles) ⓘCarpathite occurrence, Cook, Skamania County, Washington, USA
81.6km (50.7 miles) ⓘTygh Valley, Wasco County, Oregon, USA
References
Bill Thompkins
 
and/or  
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