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Onyx
from
South America
Brazil
Pará
São Geraldo do Araguaia
ⓘ
Manoel Ambrósio ranch
Revista Brasileira de Geociências, vol.30
Rio Grande do Sul
ⓘ
Salto do Jacuí
Strieder, A. J., & Heemann, R. (2006). Structural constraints on Paraná basalt volcanism and their implications on agate geode mineralization (Salto do Jacuí, RS, Brazil). Pesquisas em Geociências. Porto Alegre, RS. Vol. 33, n. 1 (2006), p. 37-50.
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