How to identify Spirit Quartz

To correctly identify Spirit Quartz (Amethyst/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. 1

   Color

   Overall color and any zoning or banding

   Varies depending on the primary crystal: purple (amethyst), yellow/orange (citrine), brown/grey (smoky), or clear. The secondary crystals are typically lighter, often white, pale lavender, or pale yellow.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Vitreous (glassy) on both the main and secondary crystals.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Rough and spiky due to the numerous small crystals covering the main crystal. The individual small crystals are typically well-formed and terminated.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   A central prismatic quartz crystal (or cluster) with numerous smaller, often pyramidal or prismatic, quartz crystals growing outwards from its faces.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   None. Quartz exhibits conchoidal fracture.

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Hydrothermal veins and cavities within igneous or metamorphic rocks, where silica-rich fluids allow for sequential growth of quartz crystals.

Key Facts

Hardness

7 on the Mohs scale (for quartz).

Specific Gravity

2.65 g/cm³ (for quartz).

Crystal System

Trigonal.

Color

Variable (purple, yellow, brown, clear) with lighter secondary crystals.

Luster

Vitreous.

Transparency

Transparent to translucent.

Fracture

Conchoidal.

Cleavage

None.

Composition

Silicon dioxide (SiO2) with trace impurities causing color.

Physical characteristics

• Crystal Habit: Prismatic main crystal with druzy overgrowth of smaller, often pyramidal or prismatic, crystals.
• Cleavage Type: None.
• Fracture Type: Conchoidal.
• Tenacity: Brittle.
• Luster Type: Vitreous.

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