Anorthite from
USA | |
| [var. Labradorite] Gordon, "Mineralogy of Pennsylvania" 1922 p. 193. |
| R. C. Smith II, The Mineralogy of Pennsylvania 1966-1975, Special Publication No. 1, Friends of Mineralogy Pennsylvania Chapter, 1978. |
USA | |
| [var. Labradorite] Gordon, "Mineralogy of Pennsylvania" 1922 p. 193. |
| R. C. Smith II, The Mineralogy of Pennsylvania 1966-1975, Special Publication No. 1, Friends of Mineralogy Pennsylvania Chapter, 1978. |