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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Tridymite from
Obsidian Cliffs, North Sister Mountain, McKenzie Pass, Lane County, Oregon, USA


Locality type:Cliff
Classification
Species:Tridymite
Formula:SiO2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Phlogopite5
Osumilite5
Fayalite1
Hematite1
Data
Mineral Data:Click here to view Tridymite data
Locality Data:Click here to view Obsidian Cliffs, North Sister Mountain, McKenzie Pass, Lane County, Oregon, USA
Data Identifiers
Mindat Occurrence Record ID:538845
Long-form Identifier:1:3:538845:5
GUID (UUID V4):0
Nearest other occurrences of Tridymite
41.4km (25.7 miles) ⓘHarter Mountain, Linn County, Oregon, USA
70.4km (43.7 miles) ⓘNewberry Caldera, Newberry National Volcanic Monument, Deschutes County, Oregon, USA
99.4km (61.8 miles) ⓘLemolo Lake, Douglas County, Oregon, USA
References
Olsen, Edward, Bunch, T. E. (1970) Compositions of natural osumilites. American Mineralogist, 55 (5-6) 875-879
Martin, A.M.,Médard, M.,Devouard, B., Keller, L. P., Righter, K., Devidal, J-L., and Rahman, Z. (2015): Fayalite oxidation processes in Obsidian Cliffs rhyolite flow, Oregon. American Mineralogist: 100: 1153–1164.
 
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