Andesine Composition, Crystallization & Structure
Composition. Intermediate between albite and anorthite, corresponding chiefly to 1NaAlSi3O3.1CaAl2Si2O8.
Crystallization. Triclinic. Like albite
Physical Properties. Cleavage (parallel to base) better tan the other, and on this parallel striation lines due to twinning are commonly to be seen. H. = 6. = 2.69. Vitreous to pearly luster. Color white, gray, Greenish, yellowish, flesh-red. Often exhibits a beautiful play of colors, due partly to the intimate twinning and partly to inclusions.
Tests. Same as for oligoclase. To be positively distinguished from oligoclase and labradorite only by a chemical analysis or an optical examination.
Occurrence. Same as for albite, but less common. More frequently found in somewhat more basic igneous rocks, i.e., those containing less silica and more lime and magnesia.
Name. occurs in a rock called andesite, found in the Andes Mountains.
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