Epidote exists in a multifaceted form,  comprising of calcium aluminium, iron silicate, wherein metals such as ferric iron or Yttrium, Manganese and Cerium substitute for Aluminium and Calcium ions. Since Epidote is a product that is liable to alteration, the chemical formulae and composition are subject to a lot of variations. Based on the true intensity of Manganese, Iron and other elements, stones are graded either by a trade name or as a distinct mineral itself.

Zoisite is well known on account of its violet-blue form, when it is called Tanzanite

Tawmawite is a kind of  Epidote,  dark green in color, with a high content of chromium; it is mined from Burma

Clinozoisite is a form of Epidote that is white to pink in color with a  less proportion of iron content

 Unakite is a transformed form of granite with distinguishing features of Epidote and is  frequently used in cabochon jewelry.

Piemontite is an opaque form of manganese Epidotethat is red in color

Chemical Formula  
Ca2 (Fe, Al) 3 (SiO4) 3 (OH) - Calcium aluminum iron silicate

Derivation Of Name
This mineral obtains its name ‘Epidote’ from the Greek word “epidosis, which means ‘addition’, in reference to the many crystal faces in which it occurs. Even though this mineral occurs in nature, it is uncommon as a faceted gemstone and infrequently used as a gem

Occurrence 
The Epidote is a mineral that is found in abundance,  forming rocks. However,  its origin is secondary. It occurs in the metamorphic state as schistose rock and marble and in the hydrothermal transformation of many minerals, such as(Micas, Feldspars, Amphiboles, Pyroxenes, Garnets and many others), it is obtained as a product  in the composition of igneous rocks.

Gemology 
For those who collect minerals, the main forms in which they desire it are the most lustrous crystal and the elongated form,  particularly unified. Occasionally collectors require Epidote with faces transparent and dark-green in color, having trendy forms inclusive of, octagons, cushions and ovals.

Source
Epidote is found in the different geological surroundings, frequently Hornfels are formed  when it comes in contact  with metamorphosed limestone and metamorphic silicate rocks. We come across them even among igneous rocks and infrequently, they  are formed in granite pegmatites.

As per mineral data, you can  obtain supplies of Epidote deposits from several regions on the planet inclusive of  Australia, Brazil, Austria, China, and the likes.

Mineralogy  
There are several clear forms of Epidote crystals, ranging from opaque to transparent; The most precious ones are the transparent crystals.

Color
Green, white, sky-blue to yellowish blue and brown.

Hardness:
6 to 7 on the Mohs scale

Density
 3.0 to 3.50 g/cm3

Main Applications

• Epidote is referred to as a Karma stone. In case you fall in love or just have a feeling of love, it assists in loving, and likewise it is applicable to negative thinking or feelings.

• It is given to understand that Epidote is an “attraction stone’, which makes the feelings of the person wearing evident,  or responded to.