Gemstones

Characteristics of Hypersthene

Characteristics of Hypersthene: Chemical Name: Magnesium, iron silicate Formula: (Mg,Fe++)2Si2O6 Colors: Grey, brown, green Structure: Orthorhombic Hardness: 5.5 Specific Gravity: 3.35 Refractive Index: 1.65-1.67 Lustre: Vitreous Streak: White Locations: India,...

Characteristics of Diopside

Characteristics of Diopside: Chemical Name: Calcium, magnesium silicate Formula: CaMgSi2O6 Colors: White, pale to dark green, violet-blue Structure: Monoclinic Hardness: 5-6 Specific Gravity: 3.2-3.4 Refractive Index: 1.66-1.72 Lustre: Vitreous Streak:...

Characteristics of Enstatite

Characteristics of Enstatite: Chemical Name: Magnesium silicate Formula: MgSiO3  Colors: Colorless, yellow, green, brown, black Structure: Orthorhombic Hardness: 5-6 Specific Gravity: 3.2-3.3 Refractive Index: 1.66-1.67 Lustre: Vitreous Streak: Grey to...

Characteristics of Phosphophyllite

Characteristics of Phosphophyllite: Chemical Name: Hydrated zinc iron phosphate Formula: Zn 2Fe(PO 4) 2·4H2O  Colors: Colorless to deep bluish-green Structure: Monoclinic Hardness: 3-3.5 Specific Gravity: 3.08-3.10 Refractive Index: 1.59-1.62 Lustre: Vitreous Streak: White...

Characteristics of Prehnite

Characteristics of Prehnite: Chemical Name: Calcium A\aluminum silicate hydroxide Formula: Ca2Al2Si3O10(OH)2  Colors: Green, yellow, tan, white Structure: Orthorhombic Hardness: 6-6.5 Specific Gravity: 2.8-2.9 Refractive Index: 1.61-1.67 Lustre: Vitreous Streak: White...

Characteristics of Petalite

Characteristics of Petalite: Chemical Name: Lithium aluminum silicate Formula: LiAlSi4O10 Colors: Colorless to greyish-white, pink, green Structure: Monoclinic Hardness: 6-6.5 Specific Gravity: 2.4 Refractive Index: 1.50-1.52 Lustre: Vitreous Streak: White...