A former surface gypsum mine located in sec. 23, T6S, R16E, about 2 miles SSE of Dudleyville, about 1 mile E of highway 77. Operated by the National Gypsum Co.

Mineralization is a bedded lacustrine gypsum deposit hosted in the Gila group (silt, shale). The host shale is calcareous to gypsiferous.

A zone at least 100 feet thick in this area contains thick (1-8 feet [0.3 to 2.1 meters]), massive, white to grayish white, granular to microcrystalline, flat-lying gypsum beds. The gypsum beds are separated by thin layers of calcareous and gypsiferous shale and silt.

Assay data: Better than 90% gypsum.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ Gypsum

1 valid mineral.

Detailed Mineral List:

ⓘ Gypsum

Formula: CaSO₄ · 2H₂O

References:

MRDS database Dep. ID #10060184, MRDS ID #TC10141.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Gypsum	7.CD.40	CaSO₄ · 2H₂O

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Gypsum	CaSO₄ · 2H₂O
O	Oxygen
O	ⓘ Gypsum	CaSO₄ · 2H₂O
S	Sulfur
S	ⓘ Gypsum	CaSO₄ · 2H₂O
Ca	Calcium
Ca	ⓘ Gypsum	CaSO₄ · 2H₂O

Other Databases

Link to USGS MRDS:	10060184

Other Regions, Features and Areas containing this locality

North AmericaContinent

Sonoran DesertDesert
- San Pedro river valleyValley

North America PlateTectonic Plate

USA

Arizona
- ⭔San Carlos Apache Indian ReservationReservation

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

USGS Saddle Mountain Quadrangle map.

MRDS database Dep. ID #10060184, MRDS ID #TC10141; and Dep. ID #10113550, MAS ID #0040210282.

Elevatorski, E.A. (1980) Arizona Industrial Minerals: 54.

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Min. Report 4, 185 pp.

Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.

Quick NavTop Mineral List 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 06:24:34 Page updated: August 12, 2025 19:11:48

Go to top of page