Epidote

UNB-2016-0527Minerals » Silicates » Sorosilicates

Description

Two samples of granular green Epidote. Epidote (Ca2Al2FeOSiO4Si2O7(OH)) can be yellowish green to brownish black. Lustre is vitreous and streak is colourless to grey. Hardness is 6 to 7 and cleavage is perfect in one direction lengthwise. Epidote usually occurs as long, slender grooved prismatic crystals that are commonly terminated by two faces. Epidote can also occur as thick tabular crystals, can be also massive, columnar, divergent, acicular or granular.

Specifications

Object name	Epidote
ID	UNB-2016-0527
Legal status	Permanent collection
Category	Mineral
Classification	Mineral group: Silicates Sub-group: Sorosilicates
Composition	Ca2(Al,Fe)3(SiO4)3(OH) (Al,Fe)SiO4 Ca2Al3(SiO4)3(OH) Ca2Al3(SiO4)3(OH)
Origin	Rockbridge County, Virginia, U.S.A.
Pieces	1
Partial	No
Measurements	3.4cm x 6.5cm x 3.5cm 1.5cm x 2.5cm x 1cm 2.2cm x 5cm x 4cm

Map of Origin

Publications

Chesterman, C.W. 1979. Audubon Society, Field Guide to North American Rocks and Minerals. Knopf.