How can a powerful acidic substance not break down inorganic material?

A Gelatinous Cube is a massive, slime-based jelly that haunts underground dungeons, and is composed of an acidic substance which breaks down material. These creatures are unintelligent and crawl aimlessly through a dungeon. They feed by engulfing an organic mass and dissolving it inside itself. However, the acid only breaks down organic matter, leaving behind the bones of the victim as well as armor.

These undissolved materials remain in the cube as it moves through a dungeon. This fills the heart of explorers with terror, as they contemplate the grisly date awaiting them. This doesn't make sense however, as acid that is powerful enough to dissolve organic matter completely should logically dissolve everything else as well.

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How can a powerful acidic substance not break down inorganic material?

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