Unakite

• Rock composed of green epidote, white to gray quartz, and pink feldspar; chemical composition varies with mineral content 
•  opaque 
•  green white to gray, and pink in a mottled pattern; may contain black veining

Identification:

• Optic Character: opaque 
• Refractive Index: spot readings around 1.74 to 1.76, 1.55, or 1.52, depending on area tested
• Birefringence: none 
• Pleochroism: none 
• Ultraviolet Fluorescence: generally inert 
• Absorption Spectra: not diagnostic 
• Cause of Color: varies with mineral content 
• Specific Gravity: 3.00 (+.20, -.15) 
• Polish Luster: greasy to vitreous 
• Fracture: granular to uneven
• Luster: dull 
• Cleavage: none 
• Identifying Characteristics: mottled coloring, black veining 
• Crystal Habit: none, massive
• Hardness: 6 to 7 
• Toughness: fair 

Sources: US 

Stone information is reference from

Gem Reference Guide, Published by GIA. ISBN 0-87311-019-6

Gemstones of the World, Published by Sterling Publishing Co., Inc NY, ISBN 1-4027-4016-6

Encyclopedia of GEMSTONE, Published by ISHINSHA CO., LTD. ISBN 978-986-251-831-1