TY  - JOUR 
T1  - Chemical classification of common volcanic rocks based on degree of silica saturation and CaO/K<sub>2</sub>O ratio
JO  - Anais da Academia Brasileira de Ciências
A1  - SANTOS, JOÃO O.S.
A1  - HARTMANN, LÉO A.
SN  - 0001-3765
UL  - 10.1590/0001-3765202120201202
VL  - 93 
Y1  - 2021
PB  - Brasil 
ER  -