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Spessartite

Garnet

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: September 2023
Spessartite Polished Spessartite Rough Spessartite Jewelry
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Table of Contents
  • General Information
  • Spessartite Colors
  • Spessartite Spectra
  • Alternate Names
  • Countries of Origin
  • History
  • Care
  • Optical Phenomena
  • Related Videos

The name, spessartite or spessartine, is derived from the location of its original discovery in the Spessart Mountains in the Aschaffenburg district of Bavaria, Germany. The color of spessartine garnet ranges from yellow through orange to red, some material appearing brownish. The color prized most highly is an electric orange that is visually stunning. Mandarin garnet is the trade name for this bright orange variety of spessartine.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Spessartite
Species
Garnet
Transparency
Transparent
Dispersion
Strength: Moderate Fire Value: 0.027
Refractive Index
Over The Limit 1.810-1.810
Tolerance:(+0.004/-0.020)
Optic Character
NA
Optic Sign
NA
Polariscope Reaction
Singly Refractive (SR) With ADR
Fluorescence
SWUV: Inert
LWUV: Inert
CCF Reaction
None
Pleochroism
None
Hardness
7-7.5
Streak
None
Specific Gravity
4.120-4.200 Range:0.05/-0.03 Typical:4.150
Toughness
Varies
Inclusions
Spessartine garnet is a type II clarity stone. Stones might have 2-phase, liquid inclusions that are feathery in appearance and rutile needle inclusions.
Luster
SubAdamantine, Vitreous
Stability
Good
Fracture
Conchoidal
Cleavage
None
Chemical Name
manganese aluminium silicate
Chemical Formula
Mn3Al2(SiO4)3
Crystal System
Cubic
Chemistry Classification
Silicate

Spessartite Colors

  • Orange Spessartite
    Orange
  • Orange Spessartite
    Orange
  • Red Spessartite
    Red
  • Red Spessartite
    Red
  • Yellow Spessartite
    Yellow

Spessartite Spectra

Spessartite Spectra
GARNET – Spessartine

Color due to manganese Most garnets classified as Spessartine have a small iron content seen here as a weak vague band at 505nm. and a very faint one at 527nm. The darker bands centered at 462nm. and 489nm. are due to manganese and indicate a spessartine garnet. The strong absorption below 445nm. here masks another two lines due to manganese at 432nm. and 412nm

We acknowledge the significant scientific contributions of John S Harris, FGA to the study of gemstone spectra and with deep appreciation to him, acknowledges the use of his images and related notes about gemstones and their spectra in the educational materials on this website.

Alternate Names

Spessartite Garnet, Mandarin Garnet If Bright Orange

Countries of Origin

Tanzania, United Republic Of; Myanmar; Sri Lanka; United States of America; Madagascar; Zambia; Thailand; India; Mozambique; Unknown; Malawi; China; Namibia; Brazil; Nigeria; Tajikistan

History

If you enjoy warm colors, this is the garnet for you. Ranging in color from mandarin orange to a southwest-sunset, reddish-orange shade, this stone will warm any ensemble. It's a great stone for winter wear, but don't leave it in your jewelry box in summer. A pretty dress, straw hat, and sandals - with one of the spessartine beauties - say summer in capital letters!

Care

Normal care

Optical Phenomena

Cat’s-Eye Spessartine Garnet

Cat’s-eye spessartine garnet has a singular light band on the surface of a gemstone created when light encounters hollow tubes, or parallel fibrous, or needle-like, inclusions within its crystal structure. Light that strikes the inclusions within the gem reflects off the inclusions, creating a narrow band of light. One known location is Namibia, but stones have been reported from Brazil and Sri Lanka.

  • Classification
  • Optical Properties
  • Characteristic Physical properties
Common Name
Cat’s-Eye Spessartine Garnet
CCF Reaction
None
Specific Gravity
4.12
Toughness
Fair
Inclusions
Hollow tubes, needle-like inclusions

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