An U occurrence/prospect located in secs. 6 & 7, T25N, R24E, MDM.
Structure: Central Part Of Eugeosynclinal Portion Of Basin And Range Of Nevada. East Flank Of Nightingale Fault Block Mountain; Roof Pendant Of Auld Lang Syne Metasediments Which Strike N 10 E And Dip 50e. Basalt Domes Lie On Strike.

Alteration: Argillization Of Granodiorite Near Contact With Auld Lang Syne Remnant

Tectonics: Mobile Belt

Commodity: Too small in size to be economic

Deposit: A small roof pendant of quartzite near contact with granodiorite. The granodiorite is strongly weathered into gruss. The quartzite is highly fractured and has uranophane coatings on fractures within the small area. Uranophane and uraniferous hyaline opal are associated with intricate and complex limonite-filled easterly-trending fractures in a quartzite. High radioactivity is present along a 2-3 ft zone. A pegmatite dike crops out a few feet away. Highest grade is in a 1-1.5 ft zone. Fractures in quartzite show highest count of radioactivity, especially in a 6-inch zone on upper side of pendant and at base in granodiorite. Reductant was probably pyrite or marcasite. This record has been merged with m242702, which has been deleted. Discovery year: 1950's

Rock formation(s): Auld Lang Syne Group

Ore(s): E-Trending Fractures In Quartzite; Near Pegmatite Dike

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

ⓘ Uranium

Mineral List

ⓘ Opal

ⓘ var. Opal-AN

ⓘ Uranophane ?

2 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Opal

Formula: SiO₂ · nH₂O

References:

Larry J, Garside (1973). Radioactive mineral occurrences in Nevada. p. 94

ⓘ Opal var. Opal-AN

Formula: SiO₂ · nH₂O

References:

Larry J, Garside (1973). Radioactive mineral occurrences in Nevada. p. 94

ⓘ Uranophane ?

Formula: Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O

References:

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Opal var. Opal-AN	4.DA.10	SiO₂ · nH₂O
ⓘ		4.DA.10	SiO₂ · nH₂O
Group 9 - Silicates
ⓘ	Uranophane ?	9.AK.15	Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Opal var. Opal-AN	SiO₂ · nH₂O
H	ⓘ Opal	SiO₂ · nH₂O
H	ⓘ Uranophane	Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O
O	Oxygen
O	ⓘ Opal var. Opal-AN	SiO₂ · nH₂O
O	ⓘ Opal	SiO₂ · nH₂O
O	ⓘ Uranophane	Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O
Si	Silicon
Si	ⓘ Opal var. Opal-AN	SiO₂ · nH₂O
Si	ⓘ Opal	SiO₂ · nH₂O
Si	ⓘ Uranophane	Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O
Ca	Calcium
Ca	ⓘ Uranophane	Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O
U	Uranium
U	ⓘ Uranophane	Ca(UO₂)₂(SiO₃OH)₂ · 5H₂O

Other Databases

Link to USGS MRDS:	10042422

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Auld Lang Syne BasinBasin
Basin and Range BasinsBasin
Golconda-Roberts Mountain DomainDomain
Havallah BasinBasin
Northern Basin and RangeWide Rift
West Nevada Permian-Triassic BasinBasin

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

U.S.A.E.C. Prelim. Report Reconn (3720), Open File

Garside, L.J., (1973), NBMG Bull 81, P. 94.

Johnson, M.G., (1977), NBMG Bull 89.

Smouse, De Forrest, (1978), Field Examination of Uranium Occurrence.

Castor, Stephen B., Ferdock, Gregory C. (2004) Minerals of Nevada. Special Publication 31. Nevada Bureau of Mines and Geology

Quick NavTop Commodities Mineral List Rock Types Other Databases Other Regions References

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 4, 2026 11:11:07 Page updated: August 18, 2025 07:50:54

Go to top of page