Gemstones

Characteristics of Chrysocolla

Characteristics of Chrysocolla: Chemical Name: Copper hydro silicate Formula: CuSiO3·2H2O Colors: Blue, blue-green Structure: Orthorhombic Hardness: 2-4 Specific Gravity: 2.0-2.4 Refractive Index: 1.46-1.57 Lustre: Vitreous to earthy Streak: Pale blue,...

Characteristics of Sepiolite

Characteristics of Sepiolite: Chemical Name: Magnesium silicate hydrate Formula: Mg4Si6O15(OH)2·6H2O Colors: White, grey, pinkish Structure: Orthorhombic Hardness: 2-2.5 Specific Gravity: 2.1-2.3 Refractive Index: 1.53 Lustre: Dull to earthy Streak: White...

Characteristics of Pezzottaite

Characteristics of Pezzottaite: Chemical Name: Cesium, lithium, beryllium silicate Formula: Cs(Be2Li)Al2Si6O18 Colors: Raspberry, red, orange-red, pink Structure: Hexagonal, trigonal Hardness: 8 Specific Gravity: 3.1 Refractive Index: 1.601-1.620 Lustre: Vitreous Streak:...

Characteristics of Soapstone

Characteristics of Soapstone: Chemical Name: Magnesium silicate hydrate Formula: Mg3Si4O10(OH)2 Colors: White, colorless, green, yellow to brown Structure: Triclinic to monoclinic Hardness: varies Specific Gravity: 2.8 Refractive Index: 1.54-1.59 Lustre:...

Characteristics of Serpentine

Characteristics of Serpentine: Chemical Name: Magnesium, iron, or nickel silicate Formula: (Mg, Fe, Ni)3Si2O5(OH)4 Colors: White, grey, yellow, green, green-blue Structure: Monoclinic Hardness: 2.5-5.5 Specific Gravity: 2.5 - 2.6 Refractive...

Characteristics of Pollucite

Characteristics of Pollucite: Chemical Name: Cesium, sodium aluminosilicate Formula: (Cs,Na) 2Al 2Si 4O 12·2H 2O Colors: Colorless, white, pink, blue, violet Structure: Cubic Hardness: 6.5-7 Specific Gravity: 2.85 - 2.94 Refractive Index: 1.51-1.525 Lustre: Vitreous...