Gemstones

Characteristics of Variscite

Characteristics of Variscite: Chemical Name: Aluminum phosphate Formula: AIPO42H2O Colors: Pale to apple-green Structure: Orthorhombic Hardness: 3.5-4.5 Specific Gravity: 2.5-2.6 Refractive Index: 1.55-1.59 Lustre: Vitreous to waxy Streak: White Locations:...

Characteristics of Cerussite

Characteristics of Cerussite: Chemical Name: Lead carbonate Formula: PbCO3 Colors: White, blue to green Structure: Orthorhombic Hardness: 3-3.5 Specific Gravity: 6.5 Refractive Index: 1.8-2.1 Lustre: Adamantine to vitreous Streak: Colorless...

Characteristics of Rhodochrosite

Characteristics of Rhodochrosite: Chemical Name: Manganese carbonate Formula: MnCO3 Colors: Rose-pink, cherry red Structure: Hexagonal, trigonal Hardness: 3.5-4 Specific Gravity: 3.6 Refractive Index: 1.6-1.8 Lustre: Vitreous to pearly Streak: White...

Characteristics of Aragonite

Characteristics of Aragonite: Chemical Name: Calcium carbonate Formula: CaCO3 Colors: Colorless, white, grey, yellowish, reddish, green Structure: Orthorhombic Hardness: 3.5-4 Specific Gravity: 2.9 Refractive Index: 1.53-1.68 Lustre: Vitreous inclining to...

Characteristics of Calcite

Characteristics of Calcite: Chemical Name: Calcium carbonate Formula: CaCO3 Colors: Colorless, white, various Structure: Trigonal Hardness: 3 Specific Gravity: 2.7 Refractive Index: 1.48-1.66 Lustre: Vitreous Streak: White Locations: Iceland, USA,...

Characteristics of Fluorite

Characteristics of Fluorite: Chemical Name: Calcium fluoride Formula: CaF2 Colors: Colorless, blue, green, purple, orange Structure: Cubic Hardness: 4 Specific Gravity: 3.0-3.3 Refractive Index: 1.43-1.44 Lustre: Vitreous Streak: White Locations:...