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Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Unnamed Au-Cu mine [28], Opal Mountain, San Bernardino County, California, USAi
Regional Level Types
Unnamed Au-Cu mine [28]Mine
Opal MountainMountain
San Bernardino CountyCounty
CaliforniaState
USACountry

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Latitude & Longitude (WGS84):
35° 9' 23'' North , 117° 10' 43'' West
Latitude & Longitude (decimal):
35.15667,-117.17861
GeoHash:
G#: 9qk8j814k
GRN:
N24W69
Type:
Mine
Köppen climate type:
BWk : Cold desert climate
Nearest Settlements:
PlacePopulationDistance
Lenwood3,543 (2011)31.9km
Barstow23,692 (2017)32.0km
Barstow Heights24,202 (2006)33.8km
Boron2,253 (2011)46.3km
Fort Irwin8,845 (2011)46.4km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Mojave Desert Gem & Mineral SocietyBarstow, California32km
Mindat Locality ID:
89919
Long-form identifier:
mindat:1:2:89919:7
GUID (UUID V4):
0


A former Au-Cu occurrence/mine located in the E½SE¼SW¼ of sec. 8, T32S, R45E, MDM, 0.8 km (0.5 mile) ESE of Opal Mountain (coordinates of record), along the southern margin of the mountain. MRDS database accuracy for this location is not stated.

Mineralization is hosted in quartz monzonite. Minor Cu-stained quartz (found on dump). The ore body strikes N80E and dips 70S. The deposit involves a 4 foot wide shear zone. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

Workings include underground openings comprised of a 25 foot incline.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List


2 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGold1.AA.05Au
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Unclassified
ⓘ'Copper Stain'-

List of minerals for each chemical element

OOxygen
Oⓘ QuartzSiO2
SiSilicon
Siⓘ QuartzSiO2
AuGold
Auⓘ GoldAu

Other Databases

Link to USGS MRDS:10035619

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America 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

Oesterling, W.A. and Spurck, W.H. (1964), Minerals for Industry, Summary of Geological Survey 1955 - 1961: Vol III - 242 pp., Southern California, Southern Pacific Company, San Francisco, CA 94105: 46.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
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