garnet

Garnet

Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. All species of garnets possess similar physical properties and crystal forms, but differ in chemical composition. The different species are pyrope, almandine, spessartine, grossular (varieties of which are hessonite and tsavorite), uvarovite and andradite. The use of red garnet dates back thousands of years, when it was used by Egyptian Pharaohs for both decorative and ceremonial purposes. The ancient Romans also wore garnet rings and traded garnet gemstones.

Stock Sizes: Available in both Faceted (including checkerboard, barrel cut and buff top) and Cabochon
Rounds: 1mm – 14mm
Oval: 3x2mm – 18x13mm
Pear: 4x3mm – 14x9mm
Marquise: 4x2mm – 18x9mm
Octagonal: 4x3mm – 14x12mm
Trillion: 3mm – 8mm
Heart: 3mm – 10mm
Square: 2mm – 10mm
Baguette: 3x2mm – 8x4mm

A large selection of specimen stones are also available

Chemical Formula: Pyrope: Mg3Al2Si3O12, Almandine: Fe2+3Al2Si3O12, Spessartine: Mn3Al2Si3O12, Grossular: Ca3Al2Si3O12, Andradite: Ca3Fe3+2Si3O12, Uvarovite: Ca3Cr2Si3O12.
Crystal Structure: (Cubic) rhombic dodecahedron, icositetrahedron
Colour: Red, brown, black, green, yellow, orange, pink, white, and colourless
Hardness: 6.5-7.5 on Moh`s scale
Refractive Index: 1.714 – 1.888
Specific Gravity: 3.5 -4.3
Cleavage: Indistinct

Treatments: Usually none, some red garnet (mostly beads) can be dyed and some Demantoid garnet are heated.

Care: Warm soapy water is always safe for cleaning garnets. The ultrasonic cleaner is usually safe except for stones that have fractures. Steam cleaning is not recommended.

 

 

Pyrope: Mg3Al2Si3O12