Gemstones

Characteristics of Phenakite

Characteristics of Phenakite: Chemical Name: Beryllium silicate Formula: Be2SiO4 Colors: Colorless, white Structure: Hexagonal/trigonal Hardness: 7.5-8 Specific Gravity: 3 Refractive Index: 1.65-1.67 Lustre: Vitreous Streak: Colorless Locations: Russia, Norway, USA,...

Characteristics of Staurolite

Characteristics of Staurolite: Chemical Name: Aluminum silicate Formula: (Fe,Mg,Zn)3-4Al18Si8O48H2-4 Colors: Brown Structure: Monoclinic Hardness: 7-7.5 Specific Gravity: 3.7 Refractive Index: 1.74-1.75 Lustre: Vitreous to resinous Streak: Colorless to grey Locations:...

Characteristics of Kyanite

Characteristics of Kyanite: Chemical Name: Aluminum silicate Formula: Al2SiO5 Colors: Blue, green, orange, colorless Structure: Triclinic Hardness: 4.5-7 Specific Gravity: 3.5-3.7 Refractive Index: 1.71-1.73 Lustre: Vitreous Streak: Colorless Locations: Brazil,...

Characteristics of Dumortierite

Characteristics of Dumortierite: Chemical Name: Aluminum-iron borosilicate Formula: Al7BO3(SiO4)3O3 Colors: Blue, violet, brown, green Structure: Orthorhombic Hardness: 7-8.5 Specific Gravity: 3.2-3.4 Refractive Index: 1.68-1.69 Lustre: Vitreous Streak: White Locations: USA,...

Characteristics of Sillimanite

Characteristics of Sillimanite: Chemical Name: Aluminosilicate Formula: Al2OSiO5 Colors: Colorless, blue, yellow, green, violet Structure: Orthorhombic Hardness: 7 Specific Gravity: 3.2-3.3 Refractive Index: 1.66-1.68 Lustre: Vitreous to silky Streak: White...

Characteristics of Titanite

Characteristics of Titanite: Chemical Name: Calcium titanium nesosilicate Formula: CaTiSiO5 Colors: Yellow, green, brown, black, pink, blue Structure: Monoclinic Hardness: 5-5.5 Specific Gravity: 3.5-3.6 Refractive Index: 1.84-2.11 Lustre: Vitreous to...