How to identify Green Beryl

To correctly identify Green Beryl (Beryl (variety: Green Beryl)), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.

Step-by-step identification

1. 1

   Color

   Overall color and any zoning or banding

   Ranges from pale green to yellowish-green or bluish-green. The green is typically less saturated and vibrant than that of emerald.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Vitreous (glassy).

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Smooth to conchoidal fracture surfaces, often with striations parallel to the c-axis on crystal faces.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Typically forms hexagonal prisms, often with flat pinacoid terminations. Can also be found as massive or granular aggregates.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   Indistinct basal cleavage {0001}, often described as poor or absent. Fracture is more common.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Granitic pegmatites, granites, and high-temperature hydrothermal veins. Also found in some mica schists and other metamorphic rocks.

Key Facts

Hardness

7.5-8 on Mohs scale

Specific Gravity

2.65-2.80 g/cm³

Crystal System

Hexagonal

Color

Pale green, yellowish-green, bluish-green (due to Fe2+ and Fe3+)

Luster

Vitreous

Transparency

Transparent to translucent

Fracture

Conchoidal to uneven

Cleavage

Indistinct basal {0001}

Composition

Beryllium aluminum silicate

Physical characteristics

• Crystal Habit: Prismatic, typically hexagonal prisms, often with striations parallel to the c-axis. Can also be massive or granular.
• Cleavage Type: Indistinct basal cleavage {0001}. Fracture is more prevalent than cleavage.
• Fracture Type: Conchoidal to uneven.
• Tenacity: Brittle.
• Luster Type: Vitreous (glassy).

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