Polyhalite and Lapis lazuli Physical Properties

Polyhalite and Lapis lazuli Chemical Formula

While comparing Polyhalite and Lapis lazuli physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Polyhalite and Lapis lazuli chemical formula.

• Chemical formula of Polyhalite- K2Ca2Mg(SO4)4·2H2O
• Chemical formula of Lapis lazuli- The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)₈Al₆Si₆O₂₄(S,SO)₄

Polyhalite and Lapis lazuli Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Lapis lazuli Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Lapis lazuli Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 2.50-3.00 whereas that of Lapis lazuli is 2.50-3.00.