Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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

Gyp Hill Dome (Falfurrias Dome; Loma Blanca), Falfurrias, Brooks County, Texas, USAi
Regional Level Types
Gyp Hill Dome (Falfurrias Dome; Loma Blanca)Dome
Falfurrias- not defined -
Brooks CountyCounty
TexasState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
Latitude & Longitude (WGS84):
27° 8' 59'' North , 98° 5' 59'' West
Latitude & Longitude (decimal):
27.15000,-98.10000
GRN:
N19W62
Type:
Dome
Köppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Cantu Addition188 (2011)8.0km
Flowella118 (2011)8.2km
Falfurrias4,962 (2017)9.6km
Premont2,659 (2017)23.5km
Encino143 (2011)24.0km
Mindat Locality ID:
41998
Long-form identifier:
mindat:1:2:41998:2
GUID (UUID V4):
0


A salt-gypsum-anhydrite deposit located 9.4 km (5.8 miles) SSE of Falfurrias, on private land. Discovered in 1911 by Producers Oil Company.

Mineralization is a salt dome deposit (Mineral occurrence model information: Model code: 252; USGS model code: 35a.4 (35ad); Deposit model name: Salt domes: diapiric salt structures), hosted in Middle Jurassic evaporite and the Late Jurassic Louann Salt. The ore body has a depth-to-bottom of 271.27 meters and a depth-to-top of 0.0 meters. The caprock outcrops. The depth to salt is 895 feet. Salt volume is 2.3 cubic miles to 10,560 feet of depth. Exposed selenite deposit covers an area of 50 acres. Local rocks include sand sheet deposits.

Local geologic structures include a piercement salt dome.

Analytical data results: The salt contains 13 to 42% anhydrite.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

5 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Sulphur1.CC.05S8
Group 3 - Halides
ⓘHalite3.AA.20NaCl
Group 5 - Nitrates and Carbonates
ⓘDolomite5.AB.10CaMg(CO3)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘAnhydrite7.AD.30CaSO4
ⓘGypsum7.CD.40CaSO4 · 2H2O
ⓘvar. Selenite7.CD.40CaSO4 · 2H2O

List of minerals for each chemical element

HHydrogen
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ Gypsum var. SeleniteCaSO4 · 2H2O
CCarbon
Cⓘ DolomiteCaMg(CO3)2
OOxygen
Oⓘ AnhydriteCaSO4
Oⓘ DolomiteCaMg(CO3)2
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ Gypsum var. SeleniteCaSO4 · 2H2O
NaSodium
Naⓘ HaliteNaCl
MgMagnesium
Mgⓘ DolomiteCaMg(CO3)2
SSulfur
Sⓘ AnhydriteCaSO4
Sⓘ GypsumCaSO4 · 2H2O
Sⓘ Native SulphurS8
Sⓘ Gypsum var. SeleniteCaSO4 · 2H2O
ClChlorine
Clⓘ HaliteNaCl
CaCalcium
Caⓘ AnhydriteCaSO4
Caⓘ DolomiteCaMg(CO3)2
Caⓘ GypsumCaSO4 · 2H2O
Caⓘ Gypsum var. SeleniteCaSO4 · 2H2O

Other Databases

Link to USGS MRDS:10105162

Localities in this Region

USA
  • Texas
    • Brooks County

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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

Hawkins, M. E. and C. J. Jirik (1966), Salt domes in Texas, Louisiana, Mississippi, Alabama, and offshore tidelands: a survey, U.S. Bureau of Mines Information Circular 8313.
Corpus Christi Geological Society (1967). Typical Oil and Gas Fields of South Texas: 1: 64-68.
Kreitler, O. W., and Dutton, S. P. (1983), Origin and Diagenesis of Caprock, Gyp Hill and Oakwood Salt Domes, Texas, Texas Bureau of Economic Geology, Report of Investigation RI 131, 58 pp.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Quick NavTopMineral ListOther DatabasesLocalities in RegionOther RegionsReferences
 
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 6, 2026 05:17:38 Page updated: August 27, 2025 14:00:47
Go to top of page