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Laytonville Quarry (Longvale; Longvale Quarry), Laytonville, Coastal Range, Mendocino Co., California, USA

This page kindly sponsored by Keith A. Peregrine
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Latitude & Longitude (WGS84): 39° 37' 5'' North , 123° 27' 47'' West
Latitude & Longitude (decimal): 39.61806,-123.46306
GeoHash:G#: 9r01qs0zy
Locality type:Quarry
Köppen climate type:Csb : Warm-summer Mediterranean climate

A road metal quarry located in sec. 6, T20N, R14W (MD), about 5 miles S of Laytonville.

Specimens are commonly labeled as being from "Longvale" or "Longvale Quarry".

Mineralization is in blueschist metasediments of the Franciscan Formation.

Mineral List

32 valid minerals. 3 (TL) - type locality of valid minerals.

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.


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Agrell, S.O. (1964) Deerite, howieite, and zussmanite, three new minerals from the Franciscan of the Laytonville district, Mendocino County, California (title only), American Mineralogist: 49: 1507.
Agrell, S.O., M.G. Brown & McKie (1965) Deerite, howieite and zussmanite, three new minerals from the Franciscan of the Laytonville district, Mendocino County, California: American Mineralogist: 50: 278.
Chesterman, C.W. (1966b) Mineralogy of the Laytonville quarry, Mendocino County, California, in: Geology of Northern California: California Division Mines & Geol. Bulletin 190: 503, 506.
Murdoch, Joseph & Robert W. Webb (1966) Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 70, 167, 220, 239, 353, 394, 493.
Rice, S.J. (1966) A new mineral locality. California Division of Mines and Geology Mineral Information Service: 19: 7.
Onucki, H. and Ernst, W.G. (1969) Coexisting sodic amphiboles and sodic pyroxenes from blueschist facies metamorphic rocks. Mineralogical Association of America Special Paper 2: 242, 245.
Wood, R. W. (1979) The iron-rich blueschist facies minerals: 2. Howieite. Mineralogical Magazine: 43: 363-370.
Robert Muir Wood (1982) The Laytonville Quarry (Mendocino County California) Exotic Block: Iron-rich Blueschist-Facies Subduction-Zone Metamorphism. Mineralogical Magazine 45:87-99.
Pemberton, H. Earl (1983) Minerals of California: 72, 212, 221, 390-391, 392, 395, 403, 426, 432, 487, 492, 496.
Deer, W. A., Howie, R.A. & Zussman, J. (1997) Rock-Forming Minerals: Single-chain Silicates, Volume 2A. Geological Society of London, 1997. 668p.: 495.
Gaines, Richard, e.a. (1997) Dana's New Mineralogy: 1044.

Mineral and/or Locality  
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