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USA | |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Chesterman, C.W. (1966b), Mineralogy of the Laytonville quarry, Mendocino County, California, in: Geology of Northern California: California Division Mines & Geol. Bulletin 190: 503 |
| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 152. |
- State route 162 (Covelo Road)
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Switzer, George S. (1951b) Mineralogy of the California glaucophane schists. California Division of Mines and Geology Bulletin 161: 59 Van Nostrand Reinholt Press: 483. |