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A relatively new addition to the world of gems, clinohumite was first discovered in 1876 within stones erupted from Mount Vesuvius. Only recently have gem-quality pieces been found in locales including Tajikistan's Pamir Mountains. Clinohumite's coloring typically ranges from bright yellow to deep orange to red, but a few brown specimens have been found.

Clinohumite Polished
Clinohumite Classification
Common Name Clinohumite
Species Clinohumite
Clinohumite Optical Properties
Transparency Transparent - Opaque
Dispersion Strength: Moderate Fire Value: 0.021
Refractive Index 1.629-1.674
Birefringence 0.028-0.041
Optic Character Biaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG), Doubly Refractive (DR)
Fluorescence SWUV: orange-yellow
LWUV: Inert
Pleochroism Trichroic, brownish orange, orangy yellow, and colorless to yellow
Clinohumite Characteristic Physical Properties
Hardness 6
Streak White
Specific Gravity 3.130-3.750
Toughness Poor
Inclusions Clinohumite might have fingerprints, euhedral crystals and color zoning.
Luster Vitreous, Resinous
Fracture Subconchoidal
Cleavage Poor, in one direction
Clinohumite Chemistry & Crystallography
Chemical Formula (Mg, Fe2+)9(SiO4)4(F,OH))2
Crystal System Monoclinic
Chemistry Classification Silicate

Clinohumite Colors

  • White Clinohumite White
  • Orange Clinohumite Orange
  • Yellow Clinohumite Yellow
  • Brown Clinohumite Brown

Alternate Names


Countries of Origin

Tanzania, United Republic Of; Pakistan; Unknown; Italy; Tajikistan

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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.