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Unnamed Howieite-Deerite-Zussmanite occurrence (1), Longvale, Coastal Range, Mendocino Co., California, USA

Latitude: 39°36'58"N
Longitude: 123°27'19"W

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A reported mineral occurrence located in sec. 6, T20N, R14W, MDM, 7.1 km (4.4 miles) NNW of Longvale and 5.4 miles S of Laytonville on highway 101, on land of undetermined ownership. NOTE: MRDS database stated accuracy for this locality is 5,000 meters.

Mineralization is associated with Tertiary-Cretaceous Coastal Belt Rocks and/or rocks of the Franciscan Complex, unit 1 (Coast Ranges). Howieite occurs in radiating clusters of bladed, black crystals. Deerite, a black mineral occurs in somewhat felted layers of sub-parallel, needlelike crystals. Zussmanite, a green mineral occurs as tiny tabular crystals or grains disseminated in quartz and stilpnomelane, all in quartz-rich rocks derived by metamorphism of chert.

Mineral List

Deerite
Howieite

Quartz
Stilpnomelane

Zussmanite

5 entries listed. 5 valid minerals.

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References

Anonymous (1964), Three new minerals from California (deerite, howieite, and zussmanite): California Division of Mines and Geology, Mineral Information Service: 17: 138.

USGS MRDS database (2005), loc. file ID #10286314 & 10031493.

Minerals Availability System (MAS) file ID #0060450105.

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the 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 hundreds 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: 12th Apr 2012 18:55:00