A metamorphic rock composed primarily of glaucophane minerals, typically blue or gray and formed under high-pressure conditions.
From glaucophane + -ite (rock-forming suffix). Emerged in geological literature in the late 1800s as scientists classified metamorphic rock types by mineral composition.
Glaucophanite is found in subduction zones where one ocean plate dives beneath another, making these rocks literal souvenirs of the planet's most violent collisions.
Complete word intelligence in one call. Free tier — 50 lookups/day.