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Epidote
Title
Epidote
Description
Formula
Ca2Al2O∙(Al,Fe3+)OH[Si2O7][SiO4]
Structure
Orthosilicate
Crystal System
Crystal system: monoclinic (-)
Physical Properties
Colour in hand specimen: green
Cleavage: one, perfect
Hardness: 6
Optical Properties
Colour in plane polarised light: yellow-green
Pleochroism: yes
Relief: high
Birefringence: 0.015-0.051; 1st order orange to 3rd order pink
Extinction: inclined
Twinning: lamellar, not common
Rock Specimens
Mineral Name
epidote
Citation
“Epidote,” 1A Collections, accessed April 9, 2024, https://wserv3.esc.cam.ac.uk/p1acollections/items/show/46.