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

Locality type:Quarry
Classification
Species:Riebeckite
Formula:◻[Na2][Fe32+Fe23+]Si8O22(OH)2
Comments:Crystals to 1 cm & 2 cm wide.Occurs as patches of prismatic crystals in schist.
Habit:Prismatic
Colour:Bluish black
Confirmation
Validity:Believed Valid
References
References: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; Pemberton, H. Earl (1983), Minerals of California: 403.; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 70.; 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.
Associated Minerals:
Associates:Glaucophane
Lawsonite
Stilpnomelane
Associated Minerals Based on Photo Data:
Chlorite Group2 photos of Riebeckite associated with Chlorite Group at this locality.
Garnet Group2 photos of Riebeckite associated with Garnet Group at this locality.
Data
Mineral Data:Click here to view Riebeckite data
Locality Data:Click here to view Laytonville Quarry (Longvale; Longvale Quarry), Laytonville, Coastal Range, Mendocino Co., California, USA
Nearest other occurrences of Riebeckite
26.8km (16.7 miles) Covelo, Round Valley, Coastal Range, Mendocino Co., California, USA
 
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