| [var. Labradorite] Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 280. Richmond, Gerald Martin (1939), Serendibite and associated minerals from the New City Quarry, Riverside, California: American Mineralogist: 24: 725-726 |