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Dehesa Dumortierite deposit (Lehesa Dumortierite deposit), Alpine, Laguna Mountains, San Diego County, California, USAi
Regional Level Types
Dehesa Dumortierite deposit (Lehesa Dumortierite deposit)Deposit
Alpine- not defined -
Laguna MountainsMountain Range
San Diego CountyCounty
CaliforniaState
USACountry

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Latitude & Longitude (WGS84):
32° 48' 7'' North , 116° 46' 47'' West
Latitude & Longitude (decimal):
32.80194,-116.77972
GeoHash:
G#: 9mufwe7t5
GRN:
N22W71
Type:
Deposit
Köppen climate type:
Csa : Hot-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Alpine14,236 (2011)3.9km
Harbison Canyon3,841 (2011)5.1km
Crest2,593 (2011)8.3km
Granite Hills3,035 (2011)11.7km
Jamul6,163 (2011)13.1km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
El Cajon Valley Gem & Mineral SocietyEl Cajon, California17km
San Diego Gem and Mineral SocietySan Diego, California37km
San Diego Lapidary SocietySan Diego, California37km
Palomar Gem & Mineral ClubEscondido, California45km
Mindat Locality ID:
91238
Long-form identifier:
mindat:1:2:91238:2
GUID (UUID V4):
f9d9a105-ca72-4d69-80d6-7c1666cf28d6


A major dumortierite deposit and former prospect located in the N½NW¼NE¼ sec. 9, T16S, R2E, SBM, about 2.5 miles SSW of Alpine and 200 feet (90 meters) S of the Alpine-Dehesa Road.

Mineralization is a dumortierite pegmatite.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


7 valid minerals.

Detailed Mineral List:

ⓘ 'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Description: A minor constituent of dumortierite pegmatite.
ⓘ Corundum
Formula: Al2O3
Description: A microscopic constituent of dumortierite schist.
ⓘ Dumortierite
Formula: Al(Al2O)(Al2O)2(SiO4)3(BO3)
Colour: Violet-red
ⓘ 'Hypersthene'
Formula: (Mg,Fe)SiO3
Description: A component of orbicular gabbro.
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs as pseudomorphs after radiating clusters of dumortierite.
ⓘ Quartz
Formula: SiO2
ⓘ Rutile
Formula: TiO2
Description: Abundant minute crystals scattered through quartz.
ⓘ Sillimanite
Formula: Al2(SiO4)O
Description: A constituent of dumortierite gneiss.
ⓘ Titanite
Formula: CaTi(SiO4)O
Description: A minor associate of dumortierite.

Gallery:

Al(Al2O)(Al2O)2(SiO4)3(BO3)ⓘ Dumortierite
TiO2ⓘ Rutile

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘCorundum4.CB.05Al2O3
ⓘQuartz4.DA.05SiO2
ⓘRutile4.DB.05TiO2
Group 9 - Silicates
ⓘSillimanite9.AF.05Al2(SiO4)O
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘDumortierite9.AJ.10Al(Al2O)(Al2O)2(SiO4)3(BO3)
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified
ⓘ'Hypersthene'-(Mg,Fe)SiO3
ⓘ'Apatite'-Ca5(PO4)3(Cl/F/OH)

List of minerals for each chemical element

HHydrogen
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ ApatiteCa5(PO4)3(Cl/F/OH)
BBoron
Bⓘ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
OOxygen
Oⓘ CorundumAl2O3
Oⓘ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Oⓘ Hypersthene(Mg,Fe)SiO3
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ QuartzSiO2
Oⓘ RutileTiO2
Oⓘ SillimaniteAl2(SiO4)O
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ ApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
Fⓘ ApatiteCa5(PO4)3(Cl/F/OH)
MgMagnesium
Mgⓘ Hypersthene(Mg,Fe)SiO3
AlAluminium
Alⓘ CorundumAl2O3
Alⓘ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ SillimaniteAl2(SiO4)O
SiSilicon
Siⓘ DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)
Siⓘ Hypersthene(Mg,Fe)SiO3
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ QuartzSiO2
Siⓘ SillimaniteAl2(SiO4)O
Siⓘ TitaniteCaTi(SiO4)O
PPhosphorus
Pⓘ ApatiteCa5(PO4)3(Cl/F/OH)
ClChlorine
Clⓘ ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ ApatiteCa5(PO4)3(Cl/F/OH)
TiTitanium
Tiⓘ RutileTiO2
Tiⓘ TitaniteCaTi(SiO4)O
FeIron
Feⓘ Hypersthene(Mg,Fe)SiO3

Other Regions, Features and Areas containing this locality

North America
North America Plate
Pacific 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

Ford, William Ebenezer (1902), On the chemical composition of dumortierite: American Journal of Science, 4th. Series: 14: 426-430; […Zeitschr. Kristallographie, Band 37: 417-421 (1903)]: 427.
Lawson, Andrew Cowper (1904), The orbicular gabbro at Dehesa, San Diego County, California: University of California, Department of Geological Science Bulletin: 3: 383-396; […(abstract): Science, new series: 15: 415 (1902)]: 386.
Kunz, George F. (1905) Gems, Jewelers' Materials, and Ornamental Stones of California. Bulletin 37 (2nd ed.) California State Mining Bureau
Schaller, Waldemar Theodore (1905a), Dumortierite: American Journal of Science, 4th. Series: 19: 211-224; […USGS Bulletin 262: 91-120]: 96, 97, 211.
Weber, F. Harold Jr. (1963) Geology and mineral resources of San Diego County, California. County Report 3. California Division of Mines and Geology pages 171, 173
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 79, 173, 275, 307, 326, 338, 344.
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
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