Opal Hydrous silicon oxide SiO2 · nH2O

Opal in the East Region No notable occurrences in database yet. Opal in the Front Range Region Jefferson County - North Table Mountain Weld County - Stoneham Opal in the Northwest Region Mesa County - Glade Park - Opal Hill Opal in the South Central Region Park County - Spruce Grove area - Thirty-nine Mile Volcanic Field Rio Grande County - Del Norte Teller County - Cripple Creek area Opal in the Southwest Region No notable occurrences in database yet.

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