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Axinite is an uncommon mineral that usually occurs in long, flat, axe-shaped crystals, a trait that makes it highly desirable to collectors who enjoy adding various crystal forms to their collections. Its strong trichroism only adds to its special appeal. As it is rotated, different colors are displayed, including rich cinnamon browns, violets, blues or greens.

Axinite Polished
Axinite Classification
Common Name Axinite
Species Axinite
Axinite Optical Properties
Transparency Transparent - Translucent
Refractive Index 1.678-1.688
Birefringence 0.010- 0.012
Optic Character Biaxial
Optic Sign Negative
Polariscope Reaction Doubly Refractive (DR)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism Trichroic, strong violetish purple, light yellow and red-brown
Axinite Characteristic Physical Properties
Hardness 6.5-7
Streak White
Specific Gravity 3.260-3.360 Typical:3.290
Toughness Varies
Inclusions Many stones are included some with goethite fibers.
Luster Vitreous, Greasy
Fracture Conchoidal, Uneven
Cleavage Good, in one direction
Axinite Chemistry & Crystallography
Chemical Name calcium aluminum boron sorosilicate hydroxide
Chemical Formula (Ca,Fe,Mn,Mg)3Al2BSi4O15(OH)
Crystal System Triclinic
Chemistry Classification Silicate

Axinite Colors

  • Gray Axinite Gray
  • Brown Axinite Brown
  • Blue Axinite Blue

Axinite Spectra

Axinite Spectra

Color due to iron. Two broad bands are seen in the deep blue at 444nm. and 466nm. with four bands in the blue-green with the broadest at 492nm. As pleochroism is usually very strong it is advisable to use a polarizing filter to avoid the strong absorption in the darker violet and reddish-brown directions.

Jewelry Television acknowledges the significant scientific contributions of John S Harris, FGA to the study of gemstone spectra and with deep appreciation to him, acknowledges the use of his images and related notes about gemstones and their spectra in the educational materials on this website.

Countries of Origin

Canada; Pakistan; Russian Federation (the); Brazil

Sisk Gemology Reference

Showcasing 200 gemstones in over 1,000 pages and accompanied by more than 2,000 photos, The Sisk Gemology Reference is a must-have in every collector’s library. Each comprehensive, three-volume set features state-of-the-art photography, detailed illustrations, and scientifically precise descriptions to create an entrancing experience for gemstone amateurs and afficionados alike.

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.