Hiddenite

Hiddenite is named after A.E. Hidden who discovered the stone in 1879 in North Carolina.

Hiddenite is a pale- to emerald-green variety of Spodumene.

Hiddenite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 

Hiddenite Gemstones by Size

This table shows distribution of Hiddenite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:1.46 cts
Heaviest:5.14 cts
Average:2.96 cts
Total photos:5
Do you have a larger Hiddenite? Why not upload a photo?
1.46ct to 1.83ct1.83ct to 2.20ct2.20ct to 2.56ct2.56ct to 2.93ct2.93ct to 3.30ct3.30ct to 3.67ct3.67ct to 4.04ct4.04ct to 4.40ct4.40ct to 4.77ct4.77ct to 5.14ct
General Information
A variety or type of:Spodumene
Chemical Formula
LiAlSi
 
2
O
 
6
Walter Schumann, Gemstones of the world (2001)
Photos of natural/un-cut material from mindat.org
Physical Properties of Hiddenite
Mohs Hardness6 to 7
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Specific Gravity3.15 to 3.21
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
TenacityBrittle
Walter Schumann, Gemstones of the world (2001)
Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
FractureUneven
Walter Schumann, Gemstones of the world (2001)
Optical Properties of Hiddenite
Refractive Index1.657 to 1.681
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterBiaxial/+
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Birefringence0.014 to 0.016
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
PleochroismDistinct trichroism: yellow green - green - blue green
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Dispersion0.017
Walter Schumann, Gemstones of the world (2001)
Colour
Colour (General)Yellow-green, green-yellow, emerald-green
Walter Schumann, Gemstones of the world (2001)
More from other references
Colour (Chelsea Filter)Pinkish
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Causes of ColourThe coloring agent is chromium.
Walter Schumann, Gemstones of the world (2001)
TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
LustreVitreous
Walter Schumann, Gemstones of the world (2001)
Fluorescence & other light emissions
Fluorescence (General)Very weak: red-yellow
Walter Schumann, Gemstones of the world (2001)
Crystallography of Hiddenite
Crystal SystemMonoclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
HabitPrismatic, tabular
Walter Schumann, Gemstones of the world (2001)
Geological Environment
Where found:Deposits occur in granite pegmatite.
Walter Schumann, Gemstones of the world (2001)
Further Information
Mineral information:Hiddenite information at mindat.org
Significant Gem Localities
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
      • Ratnapura
Ceylon Aluvial Mine, (Book, Co. 2002)
USA
 
  • North Carolina
    • Alexander Co.
      • Hiddenite
Rocks & Min.:60:84.
Rocks & Minerals 79:5 p 344; Rocks & Min. (2007) 82:243
Copyright © Jolyon & Katya Ralph 1993-2019. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . Gemdat.org is an online information resource dedicated to providing free gemmological information to all.