the.com/epidote
the green mineral that geologists use to read the temperature of buried ancient stone.
means Epidote is a green calcium-aluminum-iron silicate mineral that forms in metamorphic and altered rocks, prized by geologists as a clue to the conditions under which those rocks formed.
from From the Greek 'epidosis,' meaning 'increase' or 'addition' — the name nods to a feature of its crystal structure, where the base of the prism has one side longer than the other, as if something had been added. It was named in the early 19th century by the French mineralogist René Just Haüy, a founder of crystallography, who had a habit of christening minerals after their geometric quirks.
- name origin
- Greek for added, after its uneven crystal faces
- pistachio look
- its yellow-green earns the nickname pistachio stone
- rock thermometer
- its presence reveals specific metamorphic temperatures and pressures
- unakite cousin
- forms the popular pink-and-green stone unakite
- color shift
- some crystals flip color depending on viewing angle