Gemstones

Characteristics of Moldavite

Characteristics of Moldavite: Chemical Name: Silicon dioxide Formula: SiO2(+Al2O3) Colors: Mossy green, greenish yellow Structure: Amorphous Hardness: 5.5 Specific Gravity: 2.40 Refractive Index: 1.48-1.54 Lustre: Vitreous Locations: Germany, Czech Republic...

Characteristics of Ammolite

Characteristics of Ammolite: Chemical Name: Aragonite polymorph Formula: CaCO3 Colors: All spectral colors -red, orange, yellow, green, blue, indigo, violet Structure: Orthorhombic Hardness: 3.5-4 Specific Gravity: 2.75-2.85 Refractive Index: 1.52-1.68...

Characteristics of Peanut Wood

Characteristics of Peanut Wood: Chemical Name: Silicon dioxide, iron oxide Formula: SiO2, CaCO3 Colors: White markings on brown, grey, green Structure: Amorphous Hardness: 6.5-7 Specific Gravity: 2.58-2.91 Refractive Index: 1.54...

Characteristics of Coral

Characteristics of Coral: Chemical Name: Calcium carbonate Formula: CaCO3 Colors: Pale pink, orange, red Structure: Rhombohedral Hardness: 3.5 Specific Gravity: 2.6-2.7 Refractive Index: 1.48-1.66 Lustre: Vitreous, waxy Streak: White Locations:...

Characteristics of Amber:

Characteristics of Amber: Chemical Name: Oxygenated hydrocarbon Formula: Organic Colors: White, yellow, orange, red, brown, blue, black, green Structure: Amorphous Hardness: 2-2.5 Specific Gravity: 1.05-1.09 Refractive Index: 1.54 Lustre: Resinous...

Characteristics of Anthracite

Characteristics of Anthracite: Chemical Name: Anthracite Formula:  C₂₄₀H₉₀O₄NS Colors: Metallic black Structure: Amorphous Hardness: 2.75-3 Specific Gravity: 1.4 Refractive Index: 1.64-1.68 Lustre: Sub-metallic Locations: Russia, Ukraine, North Korea, South Africa,...