Trapiche Emerald | Gemopedia

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

Common Name

Trapiche Emerald

Species

Beryl

Variety

Trapiche Emerald

Colors

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

Alternate Names

Gemstone Groups

Beryl

Key Separations

Appearance and spot RI. Stones usually have a spot reading between 1.56 to 1.57.

Comments

Trapiche Emerald Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.56-1.57

Birefringence

0.006-0.007

Optic Character

NA

Optic Sign

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Dichroic, weak to moderate, varying shades of body color

Dispersion

Strength: weak fire Value: 0.014

Comments

Trapiche Emerald Chemistry & Crystallography

Chemical Name

beryllium aluminum silicate

Chemical Formula

Be3Al2(SiO3)6

Synthesis

Crystal System

Hexagonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Trapiche Emerald Characteristic Physical Properties

Hardness

7.5

Streak

White

Specific Gravity

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

Comments

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