Sulphur

Sulphur gets its name via Old French from Latin "sulphur", meaning "to burn".

Sulphur forms transparent to translucent yellow or brownish crystals, which are often well formed.

Sulphur is too fragile and very sensitive to heat to be used in jewelry. It is faceted for collectors' of rare gems.
General Information
Other Names/Trade Names:
Chemical Formula
S
Walter Schumann, Gemstones of the world (2001)
Photos of natural/un-cut material from mindat.org
Physical Properties of Sulphur
Mohs Hardness1.5 to 2.5
Walter Schumann, Gemstones of the world (2001)
Specific Gravity2.05 to 2.08
Walter Schumann, Gemstones of the world (2001)
Heat SensitivityExtremely sensitive to heat, bursts when warmed in one's hand.
Walter Schumann, Gemstones of the world (2001)
Optical Properties of Sulphur
Refractive Index1.958 to 2.245
Michael O’Donoghue, Gems, Sixth edition (2006)
Optical CharacterBiaxial/+
Michael O’Donoghue, Gems, Sixth edition (2006)
Birefringence0.291
Michael O’Donoghue, Gems, Sixth edition (2006)
Colour
Colour (General)Yellow, brownish
Walter Schumann, Gemstones of the world (2001)
TransparencyTranslucent
Walter Schumann, Gemstones of the world (2001)
LustreAdamantine
Walter Schumann, Gemstones of the world (2001)
Crystallography of Sulphur
Crystal SystemOrthorhombic
Walter Schumann, Gemstones of the world (2001)
HabitDipyramidal, thick tabular crystals
Michael O’Donoghue, Gems, Sixth edition (2006)
Geological Environment
Where found:It is a sublimation product of volcanic fumaroles.
Michael O’Donoghue, Gems, Sixth edition (2006)
Further Information
Mineral information:Sulphur information at mindat.org
Significant Gem Localities
Italy
 
  • Sicily
    • Agrigento Province
        • Racalmuto saliferous deposit
          • Racalmuto salt mines
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