Bright Yellow Sulphur Specimen. Add a splash of colour to your collection! This specimen has some crystalisation on top and is from a now closed location.
Note this mineral can become a little crumbly if handled too much, best to look!
White Island, New Zealand.
5.8cm x 4.4cm x 4cm, 88g.
Sulphur makes a very beautiful colourful mineral specimen. Fine quality examples are much sought after. The unmistakable deep yellow colour is not matched by any other mineral. The nicely shaped crystal forms of sulfur add to its attractiveness. As for the odour, this occurs when water mixes with the sulphur and a small amount of hydrogen sulphide (H2S) gas is produced. Although only small amounts of H2S form from just moisture in the air. It is a powerful odor producer and is the dominating contributor to the odor of rotten eggs. Most specimens of sulfur, when kept dry do not emit a strong odor.
Sulphur is also spelt Sulfur.
Colour is a strong yellow colour in thick crystals and duller yellow in small crystals to pale yellow in massive or powdery forms. Can also be reddish or greenish yellow with impurities.
Luster is vitreous to more often resinous or earthy in massive forms.
Transparency is transparent to translucent.
Crystal System is orthorhombic; 2/m 2/m 2/m
Crystal Habits include mostly massive or powdery forms but well shaped blocky crystals are common. Crystals can be made up of two dipyramids, one with steeper faces than the other, prisms and/or pinacoids in various combinations.
Cleavage is very poor in two directions.
Fracture is conchoidal.
Streak is yellow.
Hardness is 2.
Specific Gravity is 2.0 – 2.1 (well below average)
Associated Minerals are celestite, calcite, aragonite and gypsum.
Other Characteristics: odor (see above), poor heat conductivity makes it brittle when heated and can actually crack if held tightly in a person’s hand.
Notable Occurrences include Michigan and Ohio, USA; Sicily; Poland and Chile.
Best Field Indicators are color, odor, heat sensitivity, lack of good cleavage and crystal habit.