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Boron, Kramer District (Kramer Borate District), Kern Co., California, USA

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Latitude & Longitude (WGS84): 34° 59' 58'' North , 117° 38' 56'' West
Latitude & Longitude (decimal): 34.99944,-117.64889
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Boron is a small town in the Kramer district about midway between the larger towns of Mojave to the West and Barstow in the east. Many of the workers in the big U.S. Borax open pit mine a little north of town live here. For many years borax and Kernite were mined from underground workings and at the time the open pit mine was started ~1958, it was the largest underground working in California with more than 200 miles of tunnels. Few specimens were produced from the underground workings compared to what have been produced from the open pit operation. The majority of the specimens are specimens of Colemanite crystals that were encountered just after the overburden of alluvial material had been removed from the top of the deposit and the altered cap of the borate ore body was exposed. This altered cap consisted mostly of Colemanite and Ulexite and was often quite full of crystals pockets. Other minerals like Kurnakovite, Inderite, Tunellite and Hydroboracite were also encountered. For several years, collectors were allowed to collect freely on the dumps and during this time thousands of specimens of various borate minerals were collected. Now the mine and its dumps are off limits to collectors except on rare carefully controlled occasions, usually for the little annual Boron gem and mineral show. The mine, its extensive dumps and its borate processing and production facility are continuously patrolled by security guards. Over the years there have been a few rather extensive labor disputes and this in addition to the litigious nature of American society have added to the security concerns of the company. There is however a very nice visitors center that the mine has built that overlooks the big open pit operation and an interesting video presentation is available for viewing in their small auditorium along with other historical exhibits that include one of the original 20 mule team wagon trains. Usually there is a pile of borate minerals that is periodically dumped in the parking lot of the visitors center where visitors can load up on high grade Kernite and sometimes low grade specimens of Ulexite and Colemanite.
[Rock Currier 2010]

Mineral List

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

Albite

Analcime

Anorthite

'Apatite'

'var: Carbonate-rich Apatite'

Aragonite

Arsenic

Arseniosiderite

Arsenolite

Augite

Baryte

Barytocalcite

Beidellite

Berthierite

'Biotite'

Birnessite

Borax

Calcite

Carnotite

Chabazite-Na

'Chlorite Group'

'Clays'

'Clinoptilolite'

Clinoptilolite-Na

Colemanite

Copiapite

Dolomite

Epidote

Epsomite

'Erionite'

'Fayalite-Forsterite Series'

'Feldspar Group'

'Garnet'

Garrelsite

Gerstleyite (TL)

'Gmelinite'

Gmelinite-Na

Greigite

Gypsum

var: Satin Spar Gypsum

var: Selenite

Halite

Hectorite

Hematite

'Heulandite'

Heulandite-Na

Hisingerite

'Hornblende'

Howlite

Hydroboracite

'Hypersthene'

Ilmenite

Inderite

Inyoite

Kaolinite

Kernite

'K Feldspar'

Kurnakovite

'Labradorite'

Lepidocrocite

'Limonite'

Mackinawite

Magnetite

Mazzite-Na (TL)

'Melnikovite'

Metacinnabar

Meyerhofferite

'Mica Group'

Microcline

Mirabilite

'Monazite'

Montmorillonite

Mordenite

Muscovite

var: Illite

Natrojarosite

Natrolite

'Olivine'

Opal

Orpiment

Pararealgar

'Petrified Wood'

'Phillipsite'

Phillipsite-Na

Phlogopite

Probertite (TL)

Pseudobrookite

Pyrite

Pyrrhotite

Quartz

var: Agate

var: Chalcedony

var: Jasper

Realgar

Rhodochrosite

Rutile

Saponite

var: Ferroan Saponite

Sassolite

Searlesite

Sideronatrite

Smythite

Stibnite

'Stilbite'

'Strontian Aragonite'

Strontianite

Sulphur

'Thénardite'

Tincalconite

Titanite

Todorokite

'Tourmaline'

Tridymite

Tunellite (TL)

Ulexite

Veatchite

Wardsmithite

Witherite

'Zeolite Group'

Zircon


85 valid minerals. 4 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

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

Select Rock List Type

Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Holocene - Pliocene
0 - 5.333 Ma



ID: 2885167
Quaternary alluvium and marine deposits

Age: Cenozoic (0 - 5.333 Ma)

Stratigraphic Name: Temescal Formation; Modesto Formation; Victor Formation; Alameda Formation; Aromas Red Sands; Bautista Beds; Brawley Formation; Borrego Formation; Burnt Canyon Breccia; Cabezon Fanglomerate; Campus Formation; Casitas Formation; Chemehuevi Formation; Corcoran Clay; Cushenbury Springs Formation; Dos Picachos Gravels; Dripping Springs Formation; Frazier Mountain Formation; Friant Formation; Harold Formation; Heights Fanglomerate; Hookton Formation (part); Huichica Formation; La Habra Formation; Manix Lake Beds; Mohawk Lake Beds; Montezuma Formation; Nadeau Gravel; Ocotillo Conglomerate; Orcutt Formation; Pacoima Formation; Pauba Formation; Peckham Formation; Pinto Formation; Resting Springs Formation; Riverbank Formation; Rohnerville Formation; San Dimas Formation; Shoemaker Gravel; Temecula Arkose; Battery Formation; Bay Point Formation; Colma Formation; Lindavista Formation; Lomita Marl; Merritt Sand; Millerton Formation; Palos Verdes Sand; San Pedro Formation; Sweitzer Formation; Timms Point Silt

Description: Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.

Lithology: Major:{coarse alluvium}, Minor:{fine alluvium}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Localities in this Region


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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chenard, G., and Chenard, D. (1962), Kern County Agate, Lapidary Journal: 16(1): 106-107.
Gems & Minerals (1966): 343: 26.
American Mineralogist (1971): 56: 1057.
Mineralogical Record (1971): 2: 37.
Currier, Rock (2010), personal communication to Mindat.org.

External Links

www.mineralsocal.org

Mineral and/or Locality  
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