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Amador Co., California, USA
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Geological Overview Of Amador County
Amador County lies almost entirely in the Sierra Nevada geomorphic province; only the extreme western portion lies in the Great Valley. From the Great Valley eastward, the range gradually rises to the glaciated crest in the vicinity of Mokelumne and Thimble Peaks, both of which lie above 9000 feet.

The older rocks of the Sierra Nevada, commonly called the Bedrock series, consist of isoclinally folded, complexly faulted metamorphic rocks of Paleozoic and Mesozoic ages, intruded by several types of igneous rocks, chiefly granitic. Unconformably overlying these rocks in the western portion of Amador County are much younger, nearly flat-lying Tertiary sediments. These nearly flat-lying sediments are commonly called the Superjacent series.

In Amador County, the older metamorphic rocks are divided into the Calaveras and Amador (Taliaferro, 1943, pp. 282-284) groups and the Mariposa formation. The Calaveras group includes all of the pre-Mesozoic rocks in this county while the Amador group and Mariposa formation are Jurassic. Taliaferro has divided the Amador group of Amador County into two distinctive formations: the Cosumnes and Logtown Ridge formations.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Albite
Alleghanyite
Amphibole Supergroup
'Anauxite'
'Andradite-Grossular Series'
Ankerite
'Apatite'
'var: Phosphorite'
Arsenopyrite
'Axinite Group'
Azurite
Bornite
Calcite
Chalcocite
Chalcopyrite
Chromite
'Chrysoprase'
Chrysotile
'Clay'
Clinochlore
var: Chromian Clinochlore

Copiapite
Copper
Cuprocopiapite
Diamond
Epsomite
Galena
'Garnet'
Gold
Graphite
'Grossular-Hibschite Series'
Halite
'Halloysite'
Hematite
Ilmenite
Kaolinite
Kornelite
'Limonite'
Löllingite
Magnesiochromite
Magnetite
Malachite
Marcasite
Melanterite
Mendozite
Molybdenite
'Monazite'
Opal
var: Wood Opal

'Petrified Wood'
'Psilomelane'
Pyrite
Pyrolusite
Pyrrhotite
Quartz
var: Amethyst
var: Chalcedony
var: Rock Crystal
var: Rose Quartz
var: Rutilated Quartz
var: Smoky Quartz
Rhodochrosite
Rhodonite
Rutile
'Silica'
Silver
'Soapstone'
Spessartine
Sphalerite
Stibnite
Strengite
Talc
Tephroite
Tetrahedrite
Thorite
Tremolite
Uvarovite
Wollastonite
Zircon


80 entries listed. 53 valid minerals.

Localities in this Region

USA
USA

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

Carlson, D.W. & W.B. Clark (1954), Mines and Minerals of Amador County, California: California Journal of Mines and Geology: 50: 167, 173, 175, 179, 180, 185, 189, 215.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 75, 436.

External Links


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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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