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Pack Rat Mine, Tule Mountain (Mount Tule; Tulley Mountain), Jacumba, Jacumba District, San Diego Co., California, USA
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Schorl
Pack Rat Mine, Tule Mountain, Jacumba, Jacumba District, San Diego Co., California, USA

Photo: Rob Lavinsky
Latitude: 32°43'2"N
Longitude: 116°13'50"W
 
 
Granite pegmatite located 7.2 km (4.5 miles) NE of Boulevard; 9.1 km (5.6 miles) WSW of Dos Cabezas; and, 11.7 km (7.3 miles) NNW of Jacumba.

Summary:

Several 10- to 20-foot-thick granite pegmatite dikes trend north 6 degrees west, dip 65 degrees west, and extend as far as one-half mile in schist and quartzite. Pegmatite pockets contain microcline, green muscovite, black tourmaline (schorl), columbite/tantalite, gem-grade beryl (goshenite and aquamarine), fluorapatite, spessartite, and quartz. Most pockets are filled with montmorillonite clay and range in size from a few inches to several feet.

Workings & Production:

Eight open cuts. According to the claimant in 1986, several specimens of aquamarine and garnet have been sold.

Sample Data:

One random chip sample of green mica contained 6.1 percent potassium, 0.15 percent fluorine, 0.00069 percent beryllium, 0.028 percent lithium, 0.016 percent magnesium, and 0.055 percent manganese. Pockets within the pegmatite were observed to contain several indicator minerals of gem-bearing zones.

Mineral List

Albite
'Apatite'
Beryl
var: Aquamarine
var: Goshenite
Cassiterite
'Columbite'
Danburite
Eosphorite
Frondelite
'Garnet'
Helvine
Herderite
Hureaulite
Hydroxylherderite
Lithiophilite
Microcline
Mitridatite
Montmorillonite
Muscovite
Phosphosiderite
Purpurite
Quartz
Robertsite
Schorl
Spessartine
Spodumene
var: Kunzite

Strengite
'Tantalite'


29 entries listed. 21 valid minerals. 1 erroneous literature entry.

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References

Todd, V. R. et al. (1987). Mineral Resources of the Sawtooth Mountains and Carrizo Gorge/ Eastern McCain Valley Wilderness Study Areas, San Diego County, California. U.S. Geological Survey Bulletin 1711-B, 26 p., maps.

Fisher, Jesse (2011), Mines and Minerals of the Southern California Pegmatite Province. Rocks & Minerals: 86: 14-34.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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