Mineral 1.0Test your knowledge of specific minerals

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(c) Mineral Picture courtesy of www.yuprocks.com
Mineral Picture courtesy of www.yuprocks.com

EpidoteCa2(Fe,Al)3(SiO4)3(OH)

Class: Silicate
Subclass: Sorosilicate
Hardness: 6 - 7
Density: 3.4 - 3.5
Streak: White
Lustre: Vitreous
Habit: Aggregate of small grains, striated faces, small but visible crystals
Colours: Greeny, yellow-green, black

  Crystal System: Monoclinic
Cleavage: Perfect
Fracture: Uneven
Magnetism: None
Reaction with HCl: None

Identification in hand sample:
Slight colour difference between this mineral and olivine, but only under magnification (where details in the crystals can be seen). Also indicitive is the presence of a cleavage plane.

Associations:
Common accessory mineral in many regional and contact metamorphed rocks, particularly in more iron-rich rocks.

Industrial / ecomonic uses:
Semiprecious gemstone

  

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