How to identify Citrine, Aquamarine, Jasper

To correctly identify Citrine, Aquamarine, Jasper (SiO2 (Citrine), Be3Al2Si6O18 (Aquamarine), SiO2 (Jasper)), 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

   Citrine: Yellow to orange-brown. Aquamarine: Blue to blue-green. Jasper: Opaque, typically red, yellow, brown, green, often multi-colored and patterned.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Citrine: Vitreous. Aquamarine: Vitreous. Jasper: Dull to vitreous, often waxy.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Citrine: Smooth, glassy. Aquamarine: Smooth, glassy. Jasper: Fine-grained, often conchoidal fracture surface.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Citrine: Hexagonal prisms with pyramidal terminations, often in geodes or drusy coatings. Aquamarine: Hexagonal prisms, often elongated. Jasper: Massive, cryptocrystalline aggregates, no visible crystals to the naked eye.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   Citrine: None. Aquamarine: Imperfect basal cleavage. Jasper: None.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Citrine: Pegmatites, hydrothermal veins, alluvial deposits. Aquamarine: Granitic pegmatites, hydrothermal veins, metamorphic rocks. Jasper: Volcanic rocks, sedimentary formations (chert beds), hydrothermal alteration zones.

Key Facts

Hardness

Citrine: 7 (Mohs). Aquamarine: 7.5-8 (Mohs). Jasper: 6.5-7 (Mohs).

Specific Gravity

Citrine: 2.65. Aquamarine: 2.68-2.80. Jasper: 2.58-2.91.

Crystal System

Citrine: Trigonal. Aquamarine: Hexagonal. Jasper: Trigonal (cryptocrystalline).

Color

Citrine: Yellow, orange, brownish-orange. Aquamarine: Blue, blue-green. Jasper: Red, yellow, brown, green, often multi-colored and patterned.

Luster

Citrine: Vitreous. Aquamarine: Vitreous. Jasper: Dull to waxy.

Transparency

Citrine: Transparent to translucent. Aquamarine: Transparent to translucent. Jasper: Opaque.

Fracture

Citrine: Conchoidal. Aquamarine: Conchoidal to uneven. Jasper: Conchoidal to splintery.

Cleavage

Citrine: None. Aquamarine: Imperfect basal. Jasper: None.

Composition

Citrine: Silicon dioxide (SiO2). Aquamarine: Beryllium aluminum silicate (Be3Al2Si6O18). Jasper: Silicon dioxide (SiO2) with various mineral inclusions.

Physical characteristics

• Crystal Habit: Citrine: Prismatic, often terminated, massive. Aquamarine: Prismatic, often elongated, massive. Jasper: Massive, cryptocrystalline.
• Cleavage Type: Citrine: None. Aquamarine: Imperfect on {0001}. Jasper: None.
• Fracture Type: Citrine: Conchoidal. Aquamarine: Conchoidal to uneven. Jasper: Conchoidal to splintery.
• Tenacity: Citrine: Brittle. Aquamarine: Brittle. Jasper: Tough.
• Luster Type: Citrine: Vitreous. Aquamarine: Vitreous. Jasper: Dull to waxy.

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