31. It is also found in phosphate bearing iron ores and rarely in pegmatites . 32. Nanpingite comes from the Nanping pegmatite in Zenghe County. 33. Boos began to further investigate the pegmatites throughout the Denver Mountain Parks region. 34. This began further research into beryl, mica, tantalum and lithium pegmatites . 35. She discovered this rare mineral at the Bald Mt . pegmatite in 1939. 36. This is observable for example in the case of tourmalines from Czech pegmatites . 37. The primary source for caesium is pollucite, a mineral from a zoned pegmatite . 38. Lighter-colored pegmatite dikes are clearly visible. 39. Brazilianite has been described from other granite pegmatites in Brazil and the United States. 40. It also appears as a rare mineral phase in pegmatite , tactite and basalt.
