Trapiche Emerald Gemstone & Information | Gemopedia by JTV | Gemopedia™

Trapiche Emerald

Trapiche emeralds hail exclusively from the emerald mines in the Boyac region of Colombia, and are so named because their patterns resemble the spoked wheels of the heavy gear locals use to grind sugar cane. Extremely limited in supply, trapiche emeralds are perhaps the rarest of all "pattern" gemstones. Their six distinct "spokes" are caused by the presence of the mineral inclusion lutite. As the hexagonal emerald crystal grew, it pushed the lutite towards the center of the crystal and then radiated out in the six directions of the emerald crystal. A truly remarkable feat, compliments of Mother Nature!

Colors

Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green

  • Trapiche-emerald classification

    CommonName
    Trapiche Emerald
    Species
    Beryl
    Variety
    Trapiche Emerald
    Colors
    Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green
    AlternateNames
    GemstoneGroups
    Beryl
    KeySeparations
    Appearance and spot RI. Stones usually have a spot reading between 1.56 to 1.57.
    ClassificationComments
  • Trapiche-emerald chemistry & crystallography

    ChemicalName
    beryllium aluminum silicate
    ChemicalFormula
    Be3Al2(SiO3)6
    Synthesis
    CrystalSystem
    Hexagonal
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Trapiche-emerald optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire Value: 0.014
    OpticalComments
    RefractiveIndex
    1.56-1.57
    Birefringence
    0.006-0.007
    OpticCharacter
    NA
    OpticSign
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    Pleochroism
    Dichroic, weak to moderate, varying shades of body color
  • Trapiche-emerald characteristic physical properties

    Hardness
    7.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.68-2.71
    Toughness
    Poor
    Inclusions
    Six green arms or spoked pattern radiating from the core viewed down the length of the crystal due to carbon-containing inclusions.
    Luster
    Vitreous
    Stability
    Fair
    Fracture
    Conchoidal
    Cleavage
    None