How to identify Carnelian and Citrine Quartz
SiO2 (Carnelian is a variety of Chalcedony, Citrine is a variety of Quartz)
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Open the appTo correctly identify Carnelian and Citrine Quartz (SiO2 (Carnelian is a variety of Chalcedony, Citrine is a variety of Quartz)), 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
Color
Overall color and any zoning or banding
Carnelian: Translucent to opaque, reddish-orange to reddish-brown. Citrine: Transparent to translucent, yellow, golden, or orange-brown.
- 2
Luster
How the surface reflects light: metallic, vitreous, dull
Vitreous (glassy) to waxy for Carnelian; Vitreous (glassy) for Citrine.
- 3
Texture
Grain size and surface feel: coarse, fine, glassy
Carnelian: Smooth, often conchoidal fracture surfaces. Citrine: Smooth, conchoidal fracture surfaces.
- 4
Crystal Form
Shape of visible crystals or crystal faces
Carnelian: Typically massive, botryoidal, or stalactitic aggregates; individual crystals are microscopic. Citrine: Prismatic hexagonal crystals, often terminated, or massive.
- 5
Cleavage
How it breaks: flat cleavage planes vs irregular fracture
None (both are varieties of quartz).
- 6
Geological Environment
The rock formation and setting where it occurs
Carnelian: Found in amygdules, veins, and as nodular masses in volcanic rocks (e.g., basalts, andesites) and sedimentary deposits (e.g., gravels, conglomerates). Citrine: Occurs in hydrothermal veins, pegmatites, and igneous and metamorphic rocks. Often found in geodes and alluvial deposits.
Key Facts
- Hardness
- 7 (Mohs scale)
- Specific Gravity
- 2.58 - 2.64 (Carnelian); 2.65 (Citrine)
- Crystal System
- Trigonal
- Color
- Carnelian: Reddish-orange to reddish-brown. Citrine: Yellow, golden, orange-brown.
- Luster
- Vitreous to waxy (Carnelian); Vitreous (Citrine).
- Transparency
- Translucent to opaque (Carnelian); Transparent to translucent (Citrine).
- Fracture
- Conchoidal
- Cleavage
- None
- Composition
- Silicon Dioxide (SiO2)
Physical characteristics
- Crystal Habit: Carnelian: Cryptocrystalline, massive, botryoidal, nodular. Citrine: Prismatic hexagonal crystals, often terminated, massive.
- Cleavage Type: None
- Fracture Type: Conchoidal
- Tenacity: Brittle
- Luster Type: Vitreous to waxy (Carnelian); Vitreous (Citrine)
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