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!
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Opal-AN from
Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA


09218580017272735936637.jpg
Opal-AN

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
07131230017272015528900.jpg
Opal-AN

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
03170780017272015541188.jpg
Opal-AN, etc.

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
07291080017272015553236.jpg
Opal-AN

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
09218580017272735936637.jpg
Opal-AN

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
07873830017362097246389.jpg
Opal-AN

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
05833180017362097251065.jpg
Opal-AN, etc.

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
08996690017362097256173.jpg
Opal-AN

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
09218580017272735936637.jpg
Opal-AN

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
07131230017272015528900.jpg
Opal-AN

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
03170780017272015541188.jpg
Opal-AN, etc.

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
07291080017272015553236.jpg
Opal-AN

Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
Locality type:Mine
Classification
Species:Opal var: Opal-AN
Formula:SiO2 · nH2O
Comments:Hyalite is plentiful and fluoresces bright green Can have 3000 ppm uranium.( Applied Optics V.20 no.8 pg.1279-1296.
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Muscovite5
Microcline3
Albite2
Autunite1
Uranophane1
Quartz1
Data
Mineral Data:Click here to view Opal-AN data
Locality Data:Click here to view Chalk Mountain Mine, Spruce Pine, Mitchell County, North Carolina, USA
Photo GalleryView Gallery (27 photos)
Data Identifiers
Mindat Occurrence Record ID:21429
Long-form Identifier:1:3:21429:6
GUID (UUID V4):0
Nearest other occurrences of Opal-AN
3.9km (2.4 miles) ⓘDeer Park No. 2 Mine, Penland, Mitchell County, North Carolina, USA
3.9km (2.4 miles) ⓘDeer Park Mine, Penland, Mitchell County, North Carolina, USA
3.9km (2.4 miles) ⓘSouthers Branch Mine (Sullins Branch Mine), Spruce Pine, Mitchell County, North Carolina, USA
5.1km (3.2 miles) ⓘPine Mountain (Pine Mountain Mine), Mitchell County, North Carolina, USA
5.7km (3.6 miles) ⓘGrassy Creek Mine, Grassy Creek, Mitchell County, North Carolina, USA
5.8km (3.6 miles) ⓘCarolina Mineral Company No. 20 Mine (Old 20 Mine), Crabtree Creek, Yancey County, North Carolina, USA
6.1km (3.8 miles) ⓘMcKinney Mine (Power Mill Creek Mine), Spruce Pine, Mitchell County, North Carolina, USA
7.1km (4.4 miles) ⓘGlenn Mine, Crabtree Creek, Mitchell County, North Carolina, USA
7.3km (4.6 miles) ⓘHollifield Mine, Little Switzerland, Mitchell County, North Carolina, USA
8.2km (5.1 miles) ⓘFanny Gouge Mine, Micaville, Celo, Yancey County, North Carolina, USA
References
Streeter, Michael (2003) A Rockhounding Guide to North Carolinas Blue Ridge Mountains. Milestone Press Inc.pp.84-85
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 3, 2026 16:46:13
Go to top of page