酸さん性せい岩がん

さ

ん

せ

い

が

ん

Meanings

1

noun

acidic rock

Geological term for igneous rock with high silica content (typically >66% SiO₂).

性sex, gender, nature

岩boulder, rock, cliff

塩えん基き性せい岩がん
Basic rock, with lower silica content (45–52% SiO₂), contrasting with acidic rock.
中ちゅう性せい岩がん
Intermediate rock, with silica content between acidic and basic rocks (52–66% SiO₂).

Compound of 酸性 (さんせい, 'acidity') and 岩 (がん, 'rock'), reflecting the high silica (acidic) composition.