Describing a rock texture in geology where the crystals form roughly equal-sized grains that fit together like puzzle pieces.
From 'grano-' (Latin granum, grain) + 'blastic' (Greek blastos, sprout or bud, referring to crystal growth). Formed in the late 1800s as geologists developed specialized vocabulary for describing metamorphic rock textures.
When rocks are buried deep underground and heated, they don't just melt—they can recrystallize into these beautiful granoblastic textures, and geologists can actually read this pattern like a thermometer recording the Earth's ancient temperatures.
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