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Endlichite is an arsenic-rich variety of vanadinite named for Dr. F. M. Endlich. Specimens are orange to brown and typically form in well developed hexagonal prisms. It is only known from Chihuahua and Durango in Mexico, Khénifra Province in Morocco, and the Chalk Mountain Mine in Nevada, United States of America.

Endlichite Rough
Endlichite Classification
Common Name Endlichite
Species Endlichite
Endlichite Optical Properties
Transparency Opaque-Translucent
Dispersion Strength: Strong Fire
Refractive Index 2.350-2.416
Birefringence 0.066
Optic Character Uniaxial
Optic Sign Negative
Polariscope Reaction Aggregate (AGG)
Pleochroism Dichroic, Un-observable or weak, varying shades of body color
Endlichite Characteristic Physical Properties
Hardness 2.5-3
Luster Adamantine, SubAdamantine, Resinous
Stability Brittle
Fracture Conchoidal, Uneven, Irregular
Cleavage None
Endlichite Chemistry & Crystallography
Chemical Name Lead Vandadate Arsenate Choride
Chemical Formula Pb5([V,As]O4)3Cl
Crystal System Hexagonal
Chemistry Classification Phosphate

Endlichite Colors

  • Multi-color Endlichite Multi-color
  • Brown Endlichite Brown
  • Orange Endlichite Orange

Alternate Names

Arsenatian Vanadinite

Countries of Origin

United States of America (the); Morocco; Mexico


Endlichite is a soft mineral so take care when handling. It contains arsenic so wash your hands after handling. Endlichite is soluable in acid.

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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.