https://wserv3.esc.cam.ac.uk/p1acollections/items/browse?tags=low+grade&output=atom <![CDATA[1A Collections]]> 2024-04-09T21:16:19+01:00 Omeka https://wserv3.esc.cam.ac.uk/p1acollections/items/show/46 <![CDATA[<h2>Epidote</h2>]]>

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

L354 Limestone, shelly

Mineral Name

epidote
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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

L354 Limestone, shelly

Mineral Name

epidote
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