How to identify Spirit Quartz

To correctly identify Spirit Quartz (Quartz (SiO2) with Amethyst/Citrine and Druzy 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 widely depending on the primary crystal: purple (amethyst), yellow/orange (citrine), smoky brown/grey (smoky quartz), or clear. The encrusting crystals are usually a lighter shade or frosted white.

2. 2

   Luster

   How the surface reflects light: metallic, vitreous, dull

   Vitreous (glassy) on the larger crystals, often duller or sub-vitreous on the smaller, encrusting crystals due to their numerous facets and smaller size.

3. 3

   Texture

   Grain size and surface feel: coarse, fine, glassy

   Rough, spiky, or 'cactus-like' due to the outward growth of numerous small crystals over a larger central crystal.

4. 4

   Crystal Form

   Shape of visible crystals or crystal faces

   Hexagonal prisms with pyramidal terminations for the larger central crystals, covered by smaller, often micro-prismatic hexagonal quartz crystals.

5. 5

   Cleavage

   How it breaks: flat cleavage planes vs irregular fracture

   None (conchoidal fracture).

6. 6

   Geological Environment

   The rock formation and setting where it occurs

   Hydrothermal veins, vugs, and cavities within igneous (e.g., basalt, granite) or metamorphic rocks, where silica-rich fluids deposit quartz over time. Often found in association with other quartz varieties and sometimes calcite or other secondary minerals.

Key Facts

Hardness

7 on the Mohs scale (for individual quartz crystals). The aggregate nature can make it seem less durable.

Specific Gravity

2.65 g/cm³ (for quartz).

Crystal System

Trigonal.

Color

Variable: purple (amethyst), yellow/orange (citrine), smoky brown/grey (smoky quartz), or colorless (clear quartz). The outer layer is often lighter.

Luster

Vitreous to sub-vitreous.

Transparency

Transparent to translucent.

Fracture

Conchoidal.

Cleavage

None.

Composition

Silicon dioxide (SiO2), with trace impurities (e.g., Fe, Al) causing color variations.

Physical characteristics

• Crystal Habit: Prismatic hexagonal crystals, often terminated, with a secondary growth of smaller, outward-pointing prismatic crystals encrusting the primary crystal(s).
• Cleavage Type: Absent.
• Fracture Type: Conchoidal.
• Tenacity: Brittle.
• Luster Type: Vitreous (glassy) to sub-vitreous.

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