The Mercury Minerals from Terlingua, Texas

11 Poor ammonia ammonium bromide analyses Angle values average basal section calc calcite calcite layer Calculated calomel chlorine cleavage clinodomes color crystalline crystallography dark determined developed earthy eglestonite crystals equidimensional extinction Fair Small forms on terlinguaite gangue given gnomonic projection Goldschmidt gypsum heating hydrochloric acid hydrogen inclosed indices kleinite large face less common forms Line face long prismatic M₁ M₂ mass Medium mercuric oxide mercury minerals mercury-ammonium method millimeters minute face Montroydite crystal Moses N₂ nicols nitrogen nonvolatile normal series obtained Occurrence and measurements occurs orthodome oxide oxygen parallel pink matrix Plate powder present prism zone prismatic crystals probably Pyramid zone radicle rare forms reflections refraction Sachs section of kleinite short prismatic shown in figure shows small faces sodium carbonate specimens striated sublimate sulphate sulphur Symbol temperature Terlingua terlinguaite crystals tests tion tube usually vicinal form yellow α α