蓝莓石是一种在火星发现的球状小石，在某种赤铁矿地形附近四散。蓝莓石的形成是火星含有水份的一个证明。

蓝莓石只是一个非正式的命名。它的名称来自发现之时，就好像蓝莓松饼(Blueberry Muffin)上面四散的蓝莓一样。

Martian spherules (also known as blueberries due to their blue hue in false-color images released by NASA) are the abundant spherical hematite inclusions discovered by the Mars rover Opportunity at Meridiani Planum on the planet Mars. They are found in situ embedded in a sulfate salt evaporitic matrix, and also loose on the surface.