Open AccessClassificação e prospecção das jazidas primárias de água-marinha
Author(s) -
J. P. Cassedanne,
Jesús Alves
Publication year - 1990
Publication title -
anuário do instituto de geociências
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.202
H-Index - 12
eISSN - 1982-3908
pISSN - 0101-9759
DOI - 10.11137/1990_0_9-15
Subject(s) - pegmatite , albite , geology , muscovite , gneiss , geochemistry , quartz , precambrian , biotite , mineralogy , metamorphic rock , paleontology
The aquamarine-bearing pegmatites are generally thin, with poorly developed zoning. They are located in biotitic or porphyroblastic granitoids, kinzigites, gneiss and charnockites or in their vicinity, all being Precambrian in age. The pegmatites are divided in three types: one poorly differentiated with quartz, biotite and large K-feldspar crystals, where the graphic texture is well developed, one which contains a little albite and muscovite with regular zoning and one commonly drusic with many albite and muscovite and a little rose quartz, lepidolite and Fe-Mn phosphate minerals. The pegmatites occur isolated or in fields, mostly hand-worked. Searching guides and typical minerals used in prospection are reported.