Liddicoatite

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Liddicoatite is a calcium-rich lithium species of tourmaline named in 1977 in honor of noted gemologist Richard T. Liddicoat. Gems may form in green, pink, red, blue and purple colors, sometimes with internal multicolor banding and zoning. Large crystals are often sliced to display their natural multicolor designs.

Liddicoatite Classification
Common Name Liddicoatite
Species Tourmaline
Liddicoatite Optical Properties
Transparency Transparent - Translucent
Dispersion Strength: Weak Fire Value: 0.017
Refractive Index 1.621-1.627
Tolerance:(+0.011/-0.009)
Birefringence 0.018-0.02
Optic Character Uniaxial
Optic Sign Negative
Polariscope Reaction Doubly Refractive (DR)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism Dichroic, moderate to strong, varying shades of body color
Liddicoatite Characteristic Physical Properties
Hardness 7.5
Streak Light Brown, White
Specific Gravity Typical:3.020
Toughness Good
Inclusions Liddicoatite is a type II clarity stone. Stones might contain liquid and gas inclusions that are long and thin, reflective gas-filled fractures and color zoning.
Luster Vitreous
Stability Very Good
Fracture Conchoidal, Uneven
Cleavage Poor, in two directions
Liddicoatite Chemistry & Crystallography
Chemical Name calcium lithium aluminum bora-silicate hydroxide
Chemical Formula Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Crystal System Trigonal
Chemistry Classification Silicate

Liddicoatite Colors

  • Brown Liddicoatite Brown
  • Multi-color Liddicoatite Multi-color
  • Green Liddicoatite Green
  • Pink Liddicoatite Pink
  • Red Liddicoatite Red
  • Blue Liddicoatite Blue

Alternate Names

Fluor-Liddicoatite

Countries of Origin

Madagascar

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Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.