Gemstones

Characteristics of Scapolite

Characteristics of Scapolite: Chemical Name: Sodium, calcium silicate chloride or sulphate Formula: (Na,Ca)4[Al3Si9O24]Cl- Ca4(Al2Si2O8)3(CO3,SO4) Colors: Colorless, white, grey, yellow, orange, pink Structure: Tetragonal Hardness: 5-6 Specific Gravity: 2.5 - 2.7...

Characteristics of Haüyne

Characteristics of Haüyne: Chemical Name: Sodium, calcium aluminosilicate with sulphate Formula: (Na,Ca)4-8[AlSiO4]6(SO4) Colors: Blue, white, grey, yellow, green, or pink Structure: Cubic Hardness: 5.5-6 Specific Gravity: 2.4 - 2.5 Refractive...

Characteristics of Sodalite

Characteristics of Sodalite: Chemical Name: Sodium aluminosilicate chloride Formula: Na4Si3Al3O12Cl or Na4(Si3Al3)O12Cl. Colors: Grey, white, blue Structure: Cubic Hardness: 5.5-6 Specific Gravity: 2.1 - 2.4 Refractive Index: 1.48 Lustre: Vitreous to...

Characteristics of Lapis Lazuli

Characteristics of Lapis Lazuli: Chemical Name: Sodium Calcium Aluminum Silicate Sulfate Formula: Na3Ca(AI3Si3O12)S Colors: Blue Structure: Cubic Hardness: 5.0-5.5 Specific Gravity: 2.4 Refractive Index: 1.5 Lustre: Dull to vitreous Streak:...

Characteristics of Bytownite

Characteristics of Bytownite: Chemical Name: Sodium, calcium aluminosilicate Formula: NaSi3O8 – CaAI2Si3O8 Colors: White, grey, yellow, brown Structure: Triclinic Hardness: 6.0-6.5 Specific Gravity: 2.7 Refractive Index: 1.56-1.57 Lustre: Vitreous to...

Characteristics of Albite

Characteristics of Albite: Chemical Name: Sodium aluminosilicate Formula: NaSi3O8 Colors: White, colorless, yellow, green Structure: Triclinic Hardness: 6.0-6.5 Specific Gravity: 2.6-2.7 Refractive Index: 1.53-1.54 Lustre: Vitreous to pearly Streak: White...