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Umbalite

Garnet

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

Umbalite is also known as Malaya (Malaia) garnet. Umbalite is a relatively new member of the garnet group. First noticed in the 1960s, it was mixed in with parcels of rhodolite garnets from the Umba River Valley in East Africa. Many buyers rejected the material, so local miners and dealers gave it the Swahili name of “Malaya”, which translates to “out of the family”. Testing eventually confirmed that this new gem was a mixture of pyrope and spessartite garnet. Its lively color ranges from light to dark pink, red, and yellowish orange. After overcoming initial objections, it carved a small, but dedicated niche in the market in the 1980s, particularly in the United States. Today, umbalite is one of the more expensive garnets, and its only known sources are Kenya and Tanzania.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Umbalite
Species
Garnet
Transparency
Opaque-Transparent
Dispersion
Strength: Moderate Fire Value: 0.022
Refractive Index
Over The Limit 1.730-1.820
Optic Character
NA
Optic Sign
NA
Polariscope Reaction
Anomalous Double Refraction (ADR), Singly Refractive (SR)
Fluorescence
SWUV: Inert
LWUV: Inert
Pleochroism
None
Hardness
7-7.5
Streak
None
Toughness
Good
Inclusions
Quartz is frequently found but apatite, graphite, rutile crystals and needles, sulfides, inclusions similar to fingerprints, growth tubes, and negative crystals may also occur.
Luster
Vitreous
Fracture
Conchoidal, Uneven
Cleavage
None
Chemical Name
Magnesium Iron Manganese Aluminum Silicate
Chemical Formula
(Mg,Fe, Mn)3Al2(SiO4)3
Crystal System
Cubic
Chemistry Classification
Silicate

Umbalite Colors

  • Brown Umbalite
    Brown
  • Pink Umbalite
    Pink
  • Purple Umbalite
    Purple
  • Red Umbalite
    Red

Alternate Names

Malaya (Malaia) garnet

Countries of Origin

Tanzania, United Republic Of; Unknown

Care

Normal Care

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