Endlichite
Endlichite
Published: June 2014
Modified: October 2021
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.
General Information
Common Name
Endlichite
Species
Endlichite
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
Hardness
2.5-3
Luster
Adamantine, Resinous, SubAdamantine
Stability
Brittle
Fracture
Conchoidal, Uneven, Irregular
Cleavage
None
Chemical Name
Lead Vandadate Arsenate Choride
Chemical Formula
Pb5([V,As]O4)3Cl
Crystal System
Hexagonal
Chemistry Classification
Phosphate
Endlichite Colors
-
Brown -
Multi-color -
Orange
Alternate Names
Arsenatian Vanadinite
Countries of Origin
Morocco; Unknown; United States of America; Mexico
Care
Endlichite is a soft mineral so take care when handling. It contains arsenic so wash your hands after handling. Endlichite is soluable in acid.