Mindat Logo

Jensen Quarry (Oak Quarry), Jurupa, Jurupa Mts, Riverside Co., California, USA

Schorl
Jensen Quarry, Jurupa, Jurupa Mts, Riverside Co., California, USA
Latitude: 34°1'32"N
Longitude: 117°25'54"W
A former limestone/marble quarry located in sec. 5, T2S, R5W, SBM, 4.7 km (2.9 miles) NW of Jurupa and 4 miles W of Riverside.

First worked during World War I for marble for cement manufacture by Riverside Cement Company (the same company that owned the more famous nearby Crestmore deposit). Closed in 1927; reopened by Riverside Cement Company in 1948; closed again in 1955. Snow Rock Corporation leased the northeastern section of the quarry from the early 1960s until 1971 to mine dolomitic marble (too high in Mg for cement) for granulated roofing material. The last period of commercial activity was 1974-1979, when Riverside Cement Company removed the last of the cement-grade marble. Since 1979, the remaining pegmatites, impure marbles and other contact metamorphic rocks have been of interest only to field collectors.

In the late 1990s, the abandoned quarry was purchased by a golf club and remodelled into a spectacular course, with white marble and pegmatite cliffs as backdrop, now the "Landmark Golf Club at Oak Quarry" (renamed Oak Quarry by the golf club; not known as Oak Quarry during its active extractive years), so field collecting is no longer allowed. But the management are proud of the mineralogical heritage of their site, and the course holes bear fanciful mineral names: Biotite Bluff, Calcite Canyon, Garnet Meadow, Graphite Tower, Gypsum Gully, Limestone Dome, Magnesite Terrace, Marble Ridge, Microlite Ledge, Muscovite Marsh, Opal Outcrop, Pyrite Perch, Quartz Corner, Spinel Slide, Tourmaline Tower, Tremolite Pass, Zircon Tumble. The club house has a glass case displaying Jensen Quarry specimens, donated mainly by local collectors Anne Seminaris Davila and Nick Rose.

Mineral List

Actinolite
Albite
var: Cleavelandite
'Albite-Anorthite Series'
Allanite-(Ce)
Almandine
'Apatite'
'Apophyllite'
Aragonite
Arsenopyrite
Augite
Axinite-(Fe)
Azurite
Beryl
Beyerite
'Biotite'
Bornite
Brucite
Calcite
var: Calcite Satin Spar
Chalcocite
Chalcopyrite
'Chlorite Group'
Chondrodite
Chrysocolla
Clinobisvanite
Clinohumite
Clinozoisite
Clintonite
Corundum
Danburite
Diopside
Dolomite
Dravite
Elbaite
Epidote
Fluorellestadite
Forsterite
Galena
Geikielite
Gersdorffite
Goethite
Goosecreekite
Graphite
Grossular
Gypsum
Hambergite
'Hellandite'
'Hornblende'
Hydromagnesite
Kaolinite
Laumontite
Ludwigite
Magnesite
Magnetite
Malachite
Marialite
Microcline
Microlite Group
Monazite-(Ce)
Monticellite
Muscovite
Nontronite
Opal
Orthoclase
Pargasite
Periclase
Phlogopite
Prehnite
Pyrite
Pyrochlore Group
Pyrrhotite
Quartz
var: Smoky Quartz
Rutile
'Scapolite'
Scheelite
Schorl
'Serpentine Group'
Sphalerite
Spinel
Stibiotantalite
Stibnite
'Stilbite'
'Synchysite'
Talc
Titanite
'Tourmaline
var: Rubellite'

'var: Verdelite'
Tremolite
Vanadinite
Vesuvianite
Wollastonite
Xenotime-(Y)
Zircon
Zoisite
var: Thulite



96 entries listed. 79 valid minerals.

The above list 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

Rocks & Minerals (1932): 7: 98.

Rocks & Minerals (1933): 8: 80.

Pabst, Adolf (1938), Minerals of California: California Division Mines Bulletin 113.

Murdoch, Joseph & Joseph J. Fahey (1948), Geikielite, a new find from California (abstract): Geological Society of America Bulletin: 59: 1341-1342.

Murdoch, Joseph & Joseph J. Fahey (1949), Geikielite, a new find from California: American Mineralogist: 34: 835-838.

MacKevett, Edward Malcolm, Jr. (1951), Geology of Jurupa Mountains, San Bernardino and Riverside Counties, California: California Division Mines, Special Report 5, 14 pp.

Anonymous (1955), World news on mineral occurrences: Rocks & Minerals: 30: 141-142.

Cooney, R.L. (1956), The mineralogy of the Jensen and Henshaw quarries near Riverside, California: Unpublished Master’s thesis, University of California at Los Angeles.

Mineralogical Magazine (1964): 118.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 68, 115, 137-138, 198, 207, 222, 285, 288, 295, 371.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 55, 70, 72, 76, 85, 90, 94, 97-98, 103, 130, 143, 145, 146, 150-151, 170, 173, 200, 211, 221, 226, 236, 287, 316, 319, 336, 348, 362, 367, 368, 380, 387, 392, 398, 406, 420, 428, 431, 434, 444, 458, 461, 475, 479, 483, 486, 490, 498, 502, 507.

Devito, F. and Ordway, A. (1984). The Jensen Quarry, Riverside County, California. Mineralogical Record: 15(5): 273-290.

Lapis (2003): 28(12): 9.

This page is currently not sponsored. To sponsor this page click here.


Mineral and/or Locality  
Search Google  
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.
Current server date and time: September 23, 2014 14:23:28 Page generated: February 22, 2014 18:28:17
Mineral and Locality Search
Mineral:
and/or Locality:
Options
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds