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Inesite is part of the triclinic crystal system. It typically has pink spindly crystals that radiate out in fan like clusters. The mineral gets its name from the Greek word for “flesh fibers” due to its appearance. It is a late-stage hydrothermal mineral found in manganese deposits.

Inesite Rough
Inesite Classification
Common Name Inesite
Species Inesite
Inesite Optical Properties
Transparency Translucent-Transparent
Dispersion Strength: Weak Fire
Refractive Index 1.609-1.644
Birefringence 0.035
Optic Character Biaxial
Optic Sign Negative
Polariscope Reaction Aggregate (AGG), Anomalous Double Refraction (ADR)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism Unobservable
Inesite Characteristic Physical Properties
Hardness 5.5-6
Streak White
Toughness Poor
Luster Vitreous, Silky
Stability Brittle
Fracture Uneven
Cleavage Perfect, Good
Inesite Chemistry & Crystallography
Chemical Name hydrous calcium manganese silicate
Chemical Formula

Ca2Mn7 2+  Si10O28(OH)2 . 5H2O

Crystal System Triclinic
Chemistry Classification Silicate

Inesite Colors

  • Brown Inesite Brown
  • Pink Inesite Pink
  • Orange Inesite Orange
  • Red Inesite Red

Countries of Origin

Romania; United States of America (the); Hungary; Japan; Spain; New Zealand; Sweden; China; Italy; Mexico; South Africa; Slovakia; Australia; Germany; Indonesia


Inesite is brittle so care needs to be taken with specimens. It weathers to pale brown.

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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.