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Sinhalite

Sinhalite

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

Sinhalite is named after its discovery location, Sri Lanka, using its Sanskrit name, Sinhala. This rare gemstone was, until recently, only found in Sri Lanka, but is now mined in Tanzania, Madagascar and Burma. Often occurring in green to brown to brownish black hues, it was once mistakenly believed to be a variety of olivine.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Sinhalite
Species
Sinhalite
Transparency
Transparent - Translucent
Dispersion
Strength: Moderate Fire Value: 0.018
Refractive Index
1.665-1.712 Tolerance: (+0.005/-0.003)
Birefringence
0.036-0.039
Optic Character
Biaxial
Optic Sign
Negative
Polariscope Reaction
Doubly Refractive (DR)
Fluorescence
SWUV: Inert
LWUV: Inert
CCF Reaction
None
Pleochroism
Trichroic, moderate to strong light brown, dark brown, and greenish brown
Hardness
6.5-7
Streak
White
Specific Gravity
3.460-3.500 Typical:3.480
Toughness
Good
Inclusions
Sinhalite might have natural inclusions, sillimanite needles and can show iron staining.
Luster
Vitreous
Fracture
Conchoidal
Cleavage
None
Chemical Name
magnesium aluminum iron borate
Chemical Formula
MgAlBO4
Crystal System
Orthorhombic
Chemistry Classification
Borate

Sinhalite Colors

  • Brown Sinhalite
    Brown
  • Colorless Sinhalite
    Colorless
  • Green Sinhalite
    Green
  • Pink Sinhalite
    Pink
  • Yellow Sinhalite
    Yellow

Sinhalite Spectra

Sinhalite Spectra
SINHALITE

Color due to iron. In this large dark reddish brown sinhalite of 31cts it is possible to detect the weak band centered at 526nm. As with most dark brown stones, absorption in the deep blue to violet is strong which here is up to about 480nm. Only one of the four lines usually present in this area is captured on camera at 493nm.

Sinhalite Spectra
SINHALITE

Color due to iron. Four bands can be resolved at 452nm. 463nm. (broadest) 475nm. and 493nm. Another vague line may be detected in darker brown Sinhalite at 526nm. but is not seen here

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.

Countries of Origin

Tanzania, United Republic Of; Canada; Myanmar; Russian Federation; Unknown; Sri Lanka; United States of America; India

Care

Gentle care, moderately soft. Avoid ultrasonic cleaners.

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