Gemstones

Characteristics of Microcline

Characteristics of Microcline: Chemical Name: Potassium aluminosilicate Formula: KAlSi3O8 Colors: White, pale yellow, green, blue-green Structure: Triclinic Hardness: 6.0-6.5 Specific Gravity: 2.6 Refractive Index: 1.52-1.53 Lustre: Vitreous Streak: White Locations:...

Characteristics of Orthoclase

Characteristics of Orthoclase: Chemical Name: Potassium aluminosilicate Formula: KAlSi3O8 Colors: Colorless, white, cream, yellow, pink, brown-red Structure: Monoclinic Hardness: 6.0-6.5 Specific Gravity: 2.5-2.6 Refractive Index: 1.51-1.53 Lustre: Vitreous Streak: White...

Characteristics of Labradorite

Characteristics of Labradorite: Chemical Name: Sodium and calcium aluminosilicate (oligoclase) Formula: Na (AlSi3O3) Ca (Al2Si2O8) Colors: Blue, grey, white Structure: Triclinic Hardness: 6.0-6.5 Specific Gravity: 2.65-2.75 Refractive Index: 1.56-1.57 Lustre:...

Characteristics of Sunstone

Characteristics of Sunstone: Chemical Name: Sodium and calcium aluminosilicate (oligoclase) Formula: Na (AlSi3O3) Ca (Al2Si2O8) Colors: Grey, white, orange-brown, yellow Structure: Triclinic Hardness: 6.0-6.5 Specific Gravity: 2.62-2.65 Refractive Index: 1.53-1.55...

Characteristics of Moonstone

Characteristics of Moonstone: Chemical Name: Sodium potassium aluminum silicate Formula: (Na,K)AlSi3O8 Colors: Colorless, white Structure: Monoclinic Hardness: 6-6.5 Specific Gravity: 2.6 Refractive Index: 1.50 Lustre: Vitreous Streak: White Locations: India,...

Characteristics of Opal

Characteristics of Opal: Chemical Name: Hydrous Silicon dioxide Formula: SiO2. nH2O Colors: Colorless, white, yellow, orange, rose-red, black, dark-blue Structure: Amorphous Hardness: 5-6 Specific Gravity: 1.9-2.5 Refractive Index: 1.37-1.52 Lustre: Vitreous...