Colorado Gulch, Boulder Mountains Area, Lewis and Clark Co., Montana, USA
Contact metamorphic zone, altered limestone.
Located about 10 miles west of Helena, in sec. 13, T 9 N, R 5 W.
| 'Garnet'|| Ludwigite|| Magnetite|
3 entries listed. 2 valid minerals.
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Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 323.
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