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
Kiggins Mine, Oak Grove Fork, Clackamas County, Oregon, USA


Locality type:Mine
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Kiggins Mine, Oak Grove Fork, Clackamas County, Oregon, USA
Data Identifiers
Mindat Occurrence Record ID:472218
Long-form Identifier:1:3:472218:2
GUID (UUID V4):0
Nearest other occurrences of Opal
0.4km (0.2 miles) ⓘNisbet (Oregon Quicksilver), Oak Grove Fork, Clackamas County, Oregon, USA
22.6km (14.1 miles) ⓘMemaloose roadcut, Clackamas River localities, Clackamas County, Oregon, USA
34.0km (21.1 miles) ⓘCinnabar Occurrence, Breitenbush-Austin Hot Springs area, Santiam Mining District (Elkhorn Mining District), Marion County, Oregon, USA
34.0km (21.1 miles) ⓘPucci drillhole, Hood River County, Oregon, USA
65.5km (40.7 miles) ⓘTygh Valley, Wasco County, Oregon, USA
73.8km (45.9 miles) ⓘCarpathite occurrence, Cook, Skamania County, Washington, USA
74.4km (46.2 miles) ⓘLivingston Quarry, Orchards, Clark County, Washington, USA
77.7km (48.3 miles) ⓘRound Butte Cinder Pit, Jefferson County, Oregon, USA
87.2km (54.2 miles) ⓘRichardson Ranch, Madras, Jefferson County, Oregon, USA
92.6km (57.5 miles) ⓘThunderegg Deposit, Pony Butte, Jefferson County, Oregon, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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